feat(02-04): ink compilation pipeline + 4 authored Season-1 Ink files + runtime loader

- scripts/compile-ink.mjs: build-time inklecate runner using bundled binary
  (BLOCKER 4 — uses node_modules/inklecate/bin, not stale -windows/-mac path strings).
  Assumption A6 verified first-try on Windows; the same binary path resolution
  works on macOS + Linux per the wrapper's own getInklecatePath convention.
- scripts/compile-ink.test.mjs: 3 Vitest cases proving the compiler runs +
  emits valid JSON with inkVersion. wipe=false for the test path so it can
  run in parallel with the ink-loader test without racing on the wipe step.
- 4 Season-1 .ink files authored in voice (Lura warmth-anchor, gardener-keeper
  for compost): lura-arrival.ink, lura-mid.ink, lura-farewell.ink,
  compost-acknowledgements.ink (rewrite of Plan 02-03 scaffolded version into
  VAR-driven branch shape consumable by the runtime).
- src/content/ink-loader.ts: loadInkStory + bindGardenStateToInk +
  INK_VARIABLE_MAP. Centralized snake_case slot mapping per Pitfall 4. UTF-8
  BOM stripped before Story instantiation.
- src/content/ink-loader.test.ts: 8 cases — Story instantiation for all 4
  beats, fragment_count binding, Pitfall 4 snake_case enforcement, silent
  skip for stories missing declared vars.
- package.json: build now runs compile:ink first; ci chain runs compile:ink
  before test so ink-loader.test.ts's precondition check passes.
- .gitignore: src/content/compiled-ink/ excluded (regenerated on every build).

npm run ci exits 0; 11 new tests green (228 total).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -6,15 +6,15 @@
   "description": "A 7-Season browser narrative idle game in the lineage of A Dark Room and Universal Paperclips.",
   "scripts": {
     "dev": "vite",
-    "build": "tsc -b && vite build",
+    "build": "npm run compile:ink && tsc -b && vite build",
     "preview": "vite preview",
     "lint": "eslint . --max-warnings 0",
     "test": "vitest run --passWithNoTests=false",
     "test:watch": "vitest",
     "validate:assets": "node scripts/validate-assets.mjs",
     "check:bundle-split": "node scripts/check-bundle-split.mjs",
-    "compile:ink": "echo \"[compile:ink] no .ink files yet — Phase 2 will populate /content/dialogue/\" && exit 0",
-    "ci": "npm run lint && npm run test && npm run validate:assets && npm run build && npm run check:bundle-split"
+    "compile:ink": "node scripts/compile-ink.mjs",
+    "ci": "npm run lint && npm run compile:ink && npm run test && npm run validate:assets && npm run build && npm run check:bundle-split"
   },
   "dependencies": {
     "break_eternity.js": "^2.1.3",