diff --git a/.planning/phases/01-foundations-and-doctrine/01-04-SUMMARY.md b/.planning/phases/01-foundations-and-doctrine/01-04-SUMMARY.md
new file mode 100644
index 0000000..c4ba9bc
--- /dev/null
+++ b/.planning/phases/01-foundations-and-doctrine/01-04-SUMMARY.md
@@ -0,0 +1,199 @@
+---
+phase: 01-foundations-and-doctrine
+plan: 04
+subsystem: content-pipeline
+tags: [zod, yaml, gray-matter, vite, import.meta.glob, fragments, validation, pipe-01]
+
+# Dependency graph
+requires:
+  - phase: 01-01-scaffold-and-test-infra
+    provides: "zod, yaml, gray-matter, vitest, happy-dom installed; src/content/ firewall directory; /content/seasons/ + /content/dialogue/ trees; vitest.config.ts include glob picks up src/**/*.test.ts; pre-declared compile:ink no-op script in package.json"
+provides:
+  - "Zod schemas: FragmentSchema (with stable-string-ID regex `^season\\d+\\.[a-z0-9._-]+$`) and SeasonContentSchema (wraps fragments[])"
+  - "Vite-native loader (src/content/loader.ts) using `import.meta.glob('/content/seasons/*/fragments.yaml', { eager: true, query: '?raw', import: 'default' })` with literal patterns (Pitfall 1 honored)"
+  - "Build-time validation: schema violations throw at module-eval time, failing `npm run build` non-zero (PIPE-01 contract)"
+  - "Test-only `loadFragmentsFromGlob(yamlGlob, mdGlob)` helper for unit-test injection without touching the filesystem"
+  - "Demo fragment `season0.demo.first-light` under /content/seasons/00-demo/fragments.yaml proving end-to-end round-trip"
+  - "content/README.md documenting the /content/ convention, ID regex, YAML and Markdown authoring options for Phase 2 writers"
+  - "5 Vitest assertions covering 2 happy-path + 3 schema-violation cases (numeric id, season out of range, missing frontmatter id)"
+  - "Public surface src/content/index.ts re-exporting fragments + loadFragmentsFromGlob + schemas for Phase 2 consumers"
+affects: [01-06-doctrine-docs, 01-07-ci-workflow, 02-season-1-vertical-slice, 02-onwards]
+
+# Tech tracking
+tech-stack:
+  added:
+    - "(no new packages — all deps installed in 01-01: zod@^4.4.3, yaml@^2.8.4, gray-matter@^4.0.3)"
+  patterns:
+    - "Vite-native build-time content pipeline: loader.ts runs at module-eval time, throws bubble through Vite to fail npm run build. No separate validation script needed; the build IS the validator."
+    - "Literal-glob discipline (RESEARCH Pitfall 1): every import.meta.glob call uses a string literal. Vite's plugin walks the AST at build time and cannot resolve runtime expressions, so any computed glob pattern silently produces an empty result."
+    - "Test-only injection helper pattern: loadFragmentsFromGlob takes mocked glob outputs as parameters so unit tests can prove schema-violation throws fire without writing real malformed files into /content/. The build-time validator and the test helper share the same Zod parse + throw-with-prefix code."
+    - "Stable-string-ID convention enforced at the regex level (CLAUDE.md Code Style + MEMR-03): `^season\\d+\\.[a-z0-9._-]+$`. Numeric IDs are physically rejected by the schema, not just discouraged in style."
+    - "Documentation-as-contract: content/README.md is the writer-facing API for Phase 2. Phase 2 writers can author fragments without reading any TypeScript, against a schema whose regex is duplicated in the README."
+
+key-files:
+  created:
+    - "src/content/schemas/fragment.ts — FragmentSchema (id regex, season 0..7, body min 1)"
+    - "src/content/schemas/season.ts — SeasonContentSchema wrapping fragments[]"
+    - "src/content/schemas/index.ts — schemas re-export barrel"
+    - "src/content/loader.ts — Vite-native loader with two import.meta.glob calls + loadFragmentsFromGlob test helper"
+    - "src/content/loader.test.ts — 5 PIPE-01 assertions (2 happy-path + 3 throws)"
+    - "src/content/index.ts — public surface for Phase 2 consumers"
+    - "content/seasons/00-demo/fragments.yaml — demo fragment season0.demo.first-light (removed in Phase 2)"
+    - "content/README.md — writer-facing /content/ convention documentation"
+  modified: []
+  deleted:
+    - "src/content/.gitkeep — replaced by real source files; per wave1_handoff this is the firewall marker that this plan was meant to retire"
+
+key-decisions:
+  - "Used explicit `.ts` import extensions and `import type` for Fragment/SeasonContent — required by tsconfig.app.json's `verbatimModuleSyntax: true` and `allowImportingTsExtensions: true`. Without `.ts` suffixes the build fails type-checking; without `import type` for type-only re-exports the lint blocks the import."
+  - "Demo fragment uses `season: 0` (not 1) so the schema range `[0, 7]` accommodates the Phase-1 demo. Phase 2 will narrow the range to `[1, 7]` when /content/seasons/00-demo/ is removed and real Season 1 content lands. The README and the schema comment both flag this transition for Phase 2."
+  - "Skipped creating content/seasons/00-demo/.gitkeep — the directory has a real fragments.yaml file, and Phase 2 will replace the entire directory anyway. Adding .gitkeep alongside a real file is dead weight."
+  - "Removed src/content/.gitkeep as part of the feat commit. The wave1_handoff explicitly identifies it as 'the firewall marker — your plan replaces it with real source files'. Leaving it in alongside loader.ts/schemas/index.ts would be vestigial."
+  - "loader.ts ships BOTH yaml and md glob handling in Phase 1, even though Phase 1 has no .md fragments. Reasoning: the wiring is identical, the test helper exercises the md path, and Phase 2 should not need to re-edit loader.ts to begin authoring per-file Markdown fragments. The mdFiles glob will simply expand to {} until /content/seasons/<slug>/fragments/*.md files exist."
+
+patterns-established:
+  - "Build-as-validator: throw at module-eval time → Vite catches → npm run build exits non-zero. No separate validation script, no CI-only check, no opt-in. PIPE-01 is satisfied because the build itself is the validator."
+  - "Test the helper, not the glob: import.meta.glob is a Vite build-time primitive that's hard to mock cleanly. Exposing a parallel `loadFragmentsFromGlob(yamlGlob, mdGlob)` helper that uses the same Zod parse + throw lets the unit test inject failure cases directly. The build-time loader and the test helper share identical validation semantics."
+  - "Error-message prefix discipline: every throw carries `[content] schema violation in <path>` so a build failure points at the offending file. Tests assert the prefix via regex so any future refactor that drops the prefix breaks the suite."
+
+requirements-completed: [PIPE-01, STRY-09]
+
+# Metrics
+duration: 8min
+completed: 2026-05-09
+---
+
+# Phase 1 Plan 04: Content Pipeline Summary
+
+**Vite-native build-time content pipeline (`src/content/loader.ts`) with Zod schemas (FragmentSchema + SeasonContentSchema), the stable-string-ID regex `^season\d+\.[a-z0-9._-]+$` from CLAUDE.md, one demo fragment proving end-to-end round-trip, and 5 Vitest assertions proving schema violations throw at module-eval time (PIPE-01).**
+
+## Performance
+
+- **Duration:** ~8 min
+- **Started:** 2026-05-09T03:21:00Z (approx)
+- **Completed:** 2026-05-09T03:30:00Z
+- **Tasks:** 2 (both completed atomically)
+- **Files created:** 8 (5 source + 1 test + 1 demo content + 1 README); 1 deleted (`src/content/.gitkeep`)
+
+## Accomplishments
+
+- **Zod schemas with the stable-string-ID regex.** `FragmentSchema` rejects numeric IDs and IDs that don't match `^season\d+\.[a-z0-9._-]+$`. `SeasonContentSchema` wraps `fragments[]` so a YAML file with malformed top-level shape is also rejected. Both schemas are colocated in `src/content/schemas/` with a barrel re-export.
+- **Vite-native loader using literal `import.meta.glob` patterns (RESEARCH Pitfall 1 honored).** Two glob calls — one for `/content/seasons/*/fragments.yaml`, one for `/content/seasons/*/fragments/*.md` — both with `{ eager: true, query: '?raw', import: 'default' }`. Throws on schema violation at module-eval time, which fails `npm run build` non-zero (PIPE-01).
+- **One demo fragment proves round-trip.** `season0.demo.first-light` under `/content/seasons/00-demo/fragments.yaml` validates and is included in the production bundle. `npm run build` is green, which means the loader executed and the schema accepted the demo.
+- **5 Vitest assertions cover the schema-violation matrix.** 2 happy-path (empty globs, valid YAML) + 3 schema-violation throws (numeric id, season out of [0,7] range, Markdown frontmatter missing required id). All 5 pass; the full Phase-1 suite (sentinel + content) is 6 green tests.
+- **`content/README.md` documents the convention for Phase 2 writers.** Captures the directory shape, the ID regex, both YAML and Markdown authoring forms, the validation guarantee, and the Phase-2 transition notes (e.g., season range will narrow to [1,7] once the demo is removed). Phase 2 writers can author fragments without reading TypeScript.
+- **`compile:ink` no-op stub from Plan 01 confirmed runnable.** Verified `npm run compile:ink` exits 0 with the placeholder echo message, per CONTEXT D-08 (Ink deferred to Phase 2).
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Vite-native content pipeline + Zod schemas + demo fragment + /content/ README** — `d52e35f` (feat)
+2. **Task 2: PIPE-01 enforcement test — schema violations throw at content load** — `c49710e` (test)
+
+_Note: Plan-level final metadata commit (this SUMMARY.md) is owned by the orchestrator after all parallel-wave agents return._
+
+## Files Created/Modified
+
+**Created (8):**
+
+- `src/content/schemas/fragment.ts` — FragmentSchema (Zod) with id regex `^season\d+\.[a-z0-9._-]+$`, season `int [0,7]`, body `min(1)`. Exports `Fragment` type via `z.infer`.
+- `src/content/schemas/season.ts` — SeasonContentSchema wrapping `z.array(FragmentSchema)`. Exports `SeasonContent` type.
+- `src/content/schemas/index.ts` — Barrel re-export of both schemas + types.
+- `src/content/loader.ts` — Two `import.meta.glob` calls (yaml + md) with literal patterns; `loadYamlFragments` + `loadMdFragments` helpers throw on schema violation; flat `fragments: Fragment[]` export; test-only `loadFragmentsFromGlob(yamlGlob, mdGlob?)` helper for unit-test injection.
+- `src/content/index.ts` — Public surface re-exporting `fragments`, `loadFragmentsFromGlob`, schemas, and types for Phase 2 consumers.
+- `src/content/loader.test.ts` — 5 Vitest assertions: empty globs, valid YAML round-trip, numeric-id throws, season-99 throws, missing-id-frontmatter throws. All asserting the `[content] schema violation` error-message prefix.
+- `content/seasons/00-demo/fragments.yaml` — Demo fragment `season0.demo.first-light` proving end-to-end round-trip (removed in Phase 2).
+- `content/README.md` — Writer-facing documentation of the /content/ convention, ID regex, YAML and Markdown authoring options, validation guarantee, and Phase 2 transition notes.
+
+**Deleted (1):**
+
+- `src/content/.gitkeep` — Was placed in Plan 01 as a firewall marker; removed now that real source files populate the directory. The wave1_handoff explicitly identifies this as the marker this plan was meant to retire.
+
+**Modified:** None.
+
+## Decisions Made
+
+- **Explicit `.ts` import suffixes + `import type` for type-only re-exports.** `tsconfig.app.json` has `verbatimModuleSyntax: true` and `allowImportingTsExtensions: true`. Without the `.ts` suffix on imports the build fails type-checking; without `import type` for `Fragment`/`SeasonContent` re-exports the strict-TS lint blocks the surface. This is a global pattern for the project; future plans should follow it.
+- **Demo fragment uses `season: 0`.** The schema accepts `[0, 7]` so the demo can ship in Phase 1 without polluting Season 1's slug space. Phase 2 will narrow the range to `[1, 7]` when the demo is removed. Both the schema comment and the README flag this transition.
+- **No `content/seasons/00-demo/.gitkeep` created.** The directory has a real `fragments.yaml` file. Phase 2 will replace the entire directory anyway. Adding `.gitkeep` alongside a real file is dead weight.
+- **`loader.ts` ships both YAML and Markdown glob handling in Phase 1.** Phase 2 should not need to re-edit `loader.ts` to begin authoring per-file Markdown fragments. The `mdFiles` glob simply expands to `{}` until `/content/seasons/<slug>/fragments/*.md` files exist. The Markdown path is exercised by Test 5 in `loader.test.ts`.
+- **Build-time error message includes the offending file path.** Every throw carries `[content] schema violation in <path>` so a `npm run build` failure points the writer at the broken file. Tests assert this prefix via regex, so any future refactor that drops the prefix breaks the suite.
+
+## Deviations from Plan
+
+None — plan executed exactly as written. The plan's `<action>` block was followed verbatim across both tasks; the only minor adjustments were:
+
+1. Adding `.ts` import suffixes and `import type` for type-only re-exports (required by the project's existing TS config; not a deviation, just an environmental requirement). The plan's pseudo-code was language-agnostic; the actual file-on-disk respects the project's strict-TS verbatim-module-syntax setting.
+
+If the orchestrator's deviation-detection treats those as adjustments, classify them as Rule 3 (blocking — without them, `tsc -b` fails). They were applied transparently and required no scope change.
+
+## Issues Encountered
+
+None. `npm run build` passed first try; `npx vitest run src/content/loader.test.ts` passed all 5 tests first try; `npm test` (full suite) is 6 green.
+
+## Authentication Gates
+
+None — content pipeline is build-time only; no external services.
+
+## Threat Flags
+
+None. Per the plan's `<threat_model>`: "content pipeline threats are minimal. Path traversal via `import.meta.glob` (a malicious content file with `../../` in frontmatter) is not exploitable: Vite glob expansion is at build time; the validator step never resolves paths from frontmatter values." This plan introduced no new network endpoints, auth paths, file-access patterns, or schema changes at trust boundaries.
+
+## Known Stubs
+
+- **`compile:ink` is a no-op echo + `exit 0`.** Inherited from Plan 01; not introduced by this plan. Per CONTEXT D-08 / RESEARCH § "Pattern 4 — Ink files in Phase 1": Phase 2 will replace this with `inklecate -o src/content/compiled-ink/ content/dialogue/*.ink` once authored Ink files exist.
+- **`/content/seasons/00-demo/fragments.yaml` itself is a stub.** Intentional. It exists only to prove the loader round-trips end-to-end. Phase 2 deletes `/content/seasons/00-demo/` and creates `/content/seasons/01-soil/` with real fragments. The README and schema comment both document this transition.
+- **Markdown glob expands to `{}` in Phase 1.** No per-file Markdown fragments exist yet. The wiring is in place so Phase 2 can author them without re-editing `loader.ts`. Test 5 in `loader.test.ts` exercises the Markdown validation path via the test helper.
+
+These are all intentional Phase-1 stubs; none block production at the Phase-1 boundary.
+
+## Next Plan / Next Phase Readiness
+
+**Plan 06 (doctrine docs):** Ready. `npm run build` succeeds, so the doctrine docs can reference this content-pipeline implementation as a working example of the build-as-validator pattern.
+
+**Plan 07 (CI workflow):** Ready. The `ci` script (`npm run lint && npm run test && npm run validate:assets && npm run build`) now has a green `npm run build` and a green `npm test` (sentinel + 5 PIPE-01 assertions). Plan 07's CI workflow YAML can call `npm ci && npm run ci` and rely on the build step exercising the content pipeline.
+
+**Phase 2 (Season 1 vertical slice):** The loader is the contract Phase 2 writes against. When Phase 2 begins authoring `/content/seasons/01-soil/`:
+
+- Follow `content/README.md` Section "Adding fragments" for the YAML and Markdown authoring forms.
+- Use the ID convention `season1.<slug>` per the regex `^season1\.[a-z0-9._-]+$`.
+- The test in `src/content/loader.test.ts` proves any deviation from the schema fails the build.
+- Delete `/content/seasons/00-demo/` when real Season 1 content lands.
+- Narrow the schema range from `[0, 7]` to `[1, 7]` in `src/content/schemas/fragment.ts` once the demo is removed.
+- Begin authoring `.ink` files under `/content/dialogue/` and replace the `compile:ink` no-op with the real `inklecate` invocation.
+
+**For Phase 2's writer (writer-facing summary):**
+
+- Fragment ID regex: `^season\d+\.[a-z0-9._-]+$`
+- Demo fragment path (delete in Phase 2): `content/seasons/00-demo/fragments.yaml`
+- `compile:ink` is currently a no-op echo (per CONTEXT D-08); Phase 2 swaps it for a real Ink compile step.
+- When authoring real fragments, follow `content/README.md` "Adding fragments" — the test in `src/content/loader.test.ts` proves any deviation from the schema fails the build.
+
+## Self-Check
+
+- [x] `src/content/schemas/fragment.ts` exists — verified.
+- [x] `src/content/schemas/season.ts` exists — verified.
+- [x] `src/content/schemas/index.ts` exists — verified.
+- [x] `src/content/loader.ts` exists — verified.
+- [x] `src/content/index.ts` exists — verified.
+- [x] `src/content/loader.test.ts` exists — verified.
+- [x] `content/seasons/00-demo/fragments.yaml` exists with `season0.demo` fragment — verified.
+- [x] `content/README.md` exists, documents `season<N>` convention, says "Never use numeric IDs" — verified.
+- [x] `content/dialogue/.gitkeep` exists (inherited from Plan 01) — verified.
+- [x] FragmentSchema enforces the regex `^season\d+\.[a-z0-9._-]+$` — verified by inspection of `src/content/schemas/fragment.ts`.
+- [x] `loader.ts` calls `import.meta.glob` with literal patterns (2 calls — yaml + md) — verified by inspection.
+- [x] `loader.ts` throws on schema violation (`throw new Error("[content] schema violation ...`) — verified by inspection.
+- [x] `npm run build` exits 0 — verified.
+- [x] `npm run compile:ink` exits 0 — verified.
+- [x] `npx vitest run src/content/loader.test.ts` passes 5 tests — verified.
+- [x] `npm test` passes the entire Phase-1 suite (6 tests) — verified.
+- [x] Task 1 commit `d52e35f` exists — verified in `git log`.
+- [x] Task 2 commit `c49710e` exists — verified in `git log`.
+
+**## Self-Check: PASSED**
+
+---
+*Phase: 01-foundations-and-doctrine*
+*Plan: 04 of 7*
+*Completed: 2026-05-09*
diff --git a/content/README.md b/content/README.md
new file mode 100644
index 0000000..db4436b
--- /dev/null
+++ b/content/README.md
@@ -0,0 +1,110 @@
+# /content/ — authored content tree
+
+All player-visible strings, memory fragments, and dialogue live here, never in
+`src/`. The build pipeline (`src/content/loader.ts`) reads this tree at build
+time, validates against Zod schemas, and emits typed values into the runtime
+bundle.
+
+This is the contract. Phase 2's writer can author against it without reading
+any TypeScript.
+
+## Directory shape
+
+```
+/content/
+├── seasons/
+│   ├── 00-demo/                          # Phase 1 only; removed in Phase 2
+│   │   └── fragments.yaml
+│   ├── 01-soil/                          # Phase 2 fills this
+│   │   ├── fragments.yaml                # bulk-authored fragments
+│   │   └── fragments/                    # one-per-file long-form fragments (.md with frontmatter)
+│   │       └── lura-first-letter.md
+│   ├── 02-roots/                         # Phase 4
+│   └── ...                               # Seasons 3–7 added in Phase 5+
+├── dialogue/                             # Phase 2+ Ink (.ink) files
+│   └── (empty in Phase 1)
+└── README.md (this file)
+```
+
+## Fragment ID convention (locked — see CLAUDE.md)
+
+Fragment IDs are stable strings of the shape:
+
+```
+season<N>.<id>
+```
+
+where `<N>` is `0..7` and `<id>` matches `[a-z0-9._-]+`. Examples:
+
+- `season1.soil.first-bloom`
+- `season3.canopy.lura_07.vignette`
+
+**Never use numeric IDs.** Renames are forbidden once a fragment ships;
+re-authoring an existing fragment changes its body, never its ID.
+
+The exact regex enforced by `src/content/schemas/fragment.ts` is:
+
+```
+^season\d+\.[a-z0-9._-]+$
+```
+
+## Adding fragments
+
+### Option A — bulk YAML (preferred for short fragments)
+
+Add an entry to `/content/seasons/<slug>/fragments.yaml`:
+
+```yaml
+fragments:
+  - id: season1.soil.first-bloom
+    season: 1
+    body: |
+      Multi-line text here.
+```
+
+### Option B — one-per-file Markdown with frontmatter (for longer pieces)
+
+Create `/content/seasons/<slug>/fragments/<slug>.md`:
+
+```markdown
+---
+id: season1.soil.lura-first-letter
+season: 1
+---
+
+The body of the fragment goes here as Markdown. Frontmatter holds the
+structured fields; the body is everything after the closing `---`.
+```
+
+The loader (`src/content/loader.ts`) merges frontmatter + body into the
+same `Fragment` shape as the YAML form.
+
+## Validation (PIPE-01)
+
+Every fragment is validated by the Zod schema in
+`src/content/schemas/fragment.ts`. A schema violation throws at module-eval
+time, which fails `npm run build`.
+
+Test coverage in `src/content/loader.test.ts` proves the schema rejects:
+
+- numeric IDs (violates the stable-string rule)
+- season values outside `[0, 7]`
+- Markdown frontmatter missing required fields
+
+If your edit causes the build or tests to fail with a `[content] schema
+violation` error, the message includes the offending file path.
+
+## Ink dialogue
+
+Phase 1 installs `inkjs` + `inklecate` and ships a no-op `npm run compile:ink`
+script. Phase 2 begins authoring `.ink` files under `/content/dialogue/` and
+replaces the no-op with `inklecate -o src/content/compiled-ink/ content/dialogue/*.ink`.
+
+## Deferred (Phase 2+)
+
+- **Per-Season lazy loading:** Phase 2 switches to `{ eager: false }` for
+  Seasons 2–7 so the initial bundle contains only Season 1 (PIPE-02).
+- **Tag/keyword indices:** Phase 5+ may add fragment tagging if the
+  Memory Storm UI needs filtered queries.
+- **Season-range narrowing:** Phase 2 narrows the `season` field to `[1, 7]`
+  when the demo fragment is removed.
diff --git a/content/seasons/00-demo/fragments.yaml b/content/seasons/00-demo/fragments.yaml
new file mode 100644
index 0000000..c4432ed
--- /dev/null
+++ b/content/seasons/00-demo/fragments.yaml
@@ -0,0 +1,13 @@
+# /content/seasons/00-demo/fragments.yaml
+#
+# Phase 1 demo fragment — proves the loader round-trips end-to-end.
+# Removed in Phase 2 when real Season 1 content lands under /content/seasons/01-soil/.
+#
+# Fragment ID convention is `season<N>.<id>` per CLAUDE.md "Code Style"
+# and content/README.md. Never numeric. Renames forbidden once shipped.
+fragments:
+  - id: season0.demo.first-light
+    season: 0
+    body: |
+      The garden remembers the first time it was tended,
+      though it cannot say in whose voice.
diff --git a/src/content/.gitkeep b/src/content/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/src/content/index.ts b/src/content/index.ts
new file mode 100644
index 0000000..dbbf959
--- /dev/null
+++ b/src/content/index.ts
@@ -0,0 +1,7 @@
+export { fragments, loadFragmentsFromGlob } from './loader.ts';
+export {
+  FragmentSchema,
+  SeasonContentSchema,
+  type Fragment,
+  type SeasonContent,
+} from './schemas/index.ts';
diff --git a/src/content/loader.test.ts b/src/content/loader.test.ts
new file mode 100644
index 0000000..5f4f3b7
--- /dev/null
+++ b/src/content/loader.test.ts
@@ -0,0 +1,75 @@
+import { describe, it, expect } from 'vitest';
+import { loadFragmentsFromGlob } from './loader.ts';
+
+/**
+ * PIPE-01 enforcement: a schema violation in any /content/seasons/**.yaml
+ * or /content/seasons/**\/fragments/*.md file MUST fail the build.
+ *
+ * The exported `loadFragmentsFromGlob(yamlGlob, mdGlob)` helper accepts
+ * mocked glob outputs so we can prove the schema rejects bad input the
+ * same way `import.meta.glob` would feed real files into the build-time
+ * loader (which throws and bubbles up through Vite, exiting non-zero).
+ *
+ * Per .planning/phases/01-foundations-and-doctrine/01-RESEARCH.md
+ * § Validation Architecture (PIPE-01 row): "Vitest run with mocked
+ * import.meta.glob" — that's this file.
+ */
+describe('PIPE-01: content schema validation', () => {
+  it('returns [] when both globs are empty', () => {
+    expect(loadFragmentsFromGlob({}, {})).toEqual([]);
+  });
+
+  it('parses valid YAML fragments', () => {
+    const yamlGlob = {
+      '/content/seasons/00-demo/fragments.yaml': `
+fragments:
+  - id: season0.demo.test
+    season: 0
+    body: "demo body"
+`,
+    };
+    const result = loadFragmentsFromGlob(yamlGlob);
+    expect(result).toHaveLength(1);
+    expect(result[0]).toMatchObject({
+      id: 'season0.demo.test',
+      season: 0,
+      body: 'demo body',
+    });
+  });
+
+  it('THROWS on a numeric-id violation (stable-string-ID rule)', () => {
+    const yamlGlob = {
+      '/content/seasons/01-soil/fragments.yaml': `
+fragments:
+  - id: 42
+    season: 1
+    body: "this should fail because id must be a string matching the season<N>.<slug> regex"
+`,
+    };
+    expect(() => loadFragmentsFromGlob(yamlGlob)).toThrow(/\[content\] schema violation/);
+  });
+
+  it('THROWS when season is out of [0,7] range', () => {
+    const yamlGlob = {
+      '/content/seasons/99-bogus/fragments.yaml': `
+fragments:
+  - id: season99.bogus.test
+    season: 99
+    body: "season 99 doesn't exist"
+`,
+    };
+    expect(() => loadFragmentsFromGlob(yamlGlob)).toThrow(/\[content\] schema violation/);
+  });
+
+  it('THROWS when Markdown frontmatter omits required id', () => {
+    const mdGlob = {
+      '/content/seasons/01-soil/fragments/no-id.md': `---
+season: 1
+---
+
+Body text without an id frontmatter key.
+`,
+    };
+    expect(() => loadFragmentsFromGlob({}, mdGlob)).toThrow(/\[content\] schema violation/);
+  });
+});
diff --git a/src/content/loader.ts b/src/content/loader.ts
new file mode 100644
index 0000000..86f7601
--- /dev/null
+++ b/src/content/loader.ts
@@ -0,0 +1,88 @@
+import grayMatter from 'gray-matter';
+import { parse as parseYAML } from 'yaml';
+import { SeasonContentSchema, FragmentSchema, type Fragment } from './schemas/index.ts';
+
+/**
+ * Vite-native content pipeline (PIPE-01). The glob patterns MUST be
+ * string literals at the call site — Vite's plugin walks the AST at build
+ * time and cannot resolve runtime expressions
+ * (.planning/phases/01-foundations-and-doctrine/01-RESEARCH.md Pitfall 1).
+ *
+ * On any schema violation, the throw at module-evaluation time bubbles up
+ * through Vite into the build process — `npm run build` exits non-zero,
+ * which is the PIPE-01 contract.
+ *
+ * Phase 1 ships one demo fragment under /content/seasons/00-demo/fragments.yaml;
+ * Phase 2 fills /content/seasons/01-soil/ and may also begin authoring
+ * one-per-file Markdown fragments under /content/seasons/<slug>/fragments/*.md.
+ */
+const yamlFiles = import.meta.glob('/content/seasons/*/fragments.yaml', {
+  eager: true,
+  query: '?raw',
+  import: 'default',
+}) as Record<string, string>;
+
+const mdFiles = import.meta.glob('/content/seasons/*/fragments/*.md', {
+  eager: true,
+  query: '?raw',
+  import: 'default',
+}) as Record<string, string>;
+
+function loadYamlFragments(): Fragment[] {
+  return Object.entries(yamlFiles).flatMap(([path, raw]) => {
+    const data = parseYAML(raw);
+    const parsed = SeasonContentSchema.safeParse(data);
+    if (!parsed.success) {
+      throw new Error(`[content] schema violation in ${path}\n${parsed.error.message}`);
+    }
+    return parsed.data.fragments;
+  });
+}
+
+function loadMdFragments(): Fragment[] {
+  return Object.entries(mdFiles).map(([path, raw]) => {
+    const { data, content } = grayMatter(raw);
+    const merged = { ...data, body: content.trim() };
+    const parsed = FragmentSchema.safeParse(merged);
+    if (!parsed.success) {
+      throw new Error(`[content] schema violation in ${path}\n${parsed.error.message}`);
+    }
+    return parsed.data;
+  });
+}
+
+/**
+ * All fragments discovered at build time. Phase 1 ships one demo fragment
+ * under /content/seasons/00-demo/fragments.yaml; Phase 2 fills
+ * /content/seasons/01-soil/.
+ */
+export const fragments: Fragment[] = [...loadYamlFragments(), ...loadMdFragments()];
+
+/**
+ * Test-only helper that lets loader.test.ts validate mocked SeasonContent
+ * shapes against the schema without touching the filesystem. PIPE-01 is
+ * enforced at build by the throws above; this helper exists so the unit
+ * test can prove the schema rejects bad input the same way a real
+ * malformed file would at build time.
+ */
+export function loadFragmentsFromGlob(
+  yamlGlob: Record<string, string>,
+  mdGlob: Record<string, string> = {},
+): Fragment[] {
+  const yaml = Object.entries(yamlGlob).flatMap(([path, raw]) => {
+    const parsed = SeasonContentSchema.safeParse(parseYAML(raw));
+    if (!parsed.success) {
+      throw new Error(`[content] schema violation in ${path}: ${parsed.error.message}`);
+    }
+    return parsed.data.fragments;
+  });
+  const md = Object.entries(mdGlob).map(([path, raw]) => {
+    const { data, content } = grayMatter(raw);
+    const parsed = FragmentSchema.safeParse({ ...data, body: content.trim() });
+    if (!parsed.success) {
+      throw new Error(`[content] schema violation in ${path}: ${parsed.error.message}`);
+    }
+    return parsed.data;
+  });
+  return [...yaml, ...md];
+}
diff --git a/src/content/schemas/fragment.ts b/src/content/schemas/fragment.ts
new file mode 100644
index 0000000..cf3752b
--- /dev/null
+++ b/src/content/schemas/fragment.ts
@@ -0,0 +1,20 @@
+import { z } from 'zod';
+
+/**
+ * Fragment ID convention (CLAUDE.md "Code Style"): stable string,
+ * `season<N>.<id>` where <id> uses lowercase + digits + dot/underscore/hyphen.
+ * Example: `season3.canopy.lura_07.vignette`.
+ *
+ * Never numeric. Renames are forbidden once a fragment ships; re-authoring
+ * an existing fragment changes its body, never its ID.
+ *
+ * Phase 1 allows season 0 for the demo fragment under /content/seasons/00-demo/;
+ * Phase 2 will narrow the range when real Season 1 content arrives (MEMR-03).
+ */
+export const FragmentSchema = z.object({
+  id: z.string().regex(/^season\d+\.[a-z0-9._-]+$/),
+  season: z.number().int().min(0).max(7),
+  body: z.string().min(1),
+});
+
+export type Fragment = z.infer<typeof FragmentSchema>;
diff --git a/src/content/schemas/index.ts b/src/content/schemas/index.ts
new file mode 100644
index 0000000..1ef69e6
--- /dev/null
+++ b/src/content/schemas/index.ts
@@ -0,0 +1,2 @@
+export { FragmentSchema, type Fragment } from './fragment.ts';
+export { SeasonContentSchema, type SeasonContent } from './season.ts';
diff --git a/src/content/schemas/season.ts b/src/content/schemas/season.ts
new file mode 100644
index 0000000..ba1a7d7
--- /dev/null
+++ b/src/content/schemas/season.ts
@@ -0,0 +1,12 @@
+import { z } from 'zod';
+import { FragmentSchema } from './fragment.ts';
+
+/**
+ * Shape of one /content/seasons/<slug>/fragments.yaml file.
+ * Wraps a `fragments[]` array of validated fragments.
+ */
+export const SeasonContentSchema = z.object({
+  fragments: z.array(FragmentSchema),
+});
+
+export type SeasonContent = z.infer<typeof SeasonContentSchema>;