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>

content/dialogue/season1/lura-arrival.ink

@@ -0,0 +1,44 @@
+// Lura, arrival beat. After the player's first harvest.
+//
+// Variables read from sim (set via story.variablesState before the first
+// Continue() — see src/content/ink-loader.ts INK_VARIABLE_MAP):
+//   fragment_count   - number of harvested fragments at the moment Lura arrives
+//   last_plant_type  - 'rosemary' | 'yarrow' | 'winter-rose'
+//
+// Per Pitfall 4: Ink VAR names MUST be snake_case AND match INK_VARIABLE_MAP
+// keys exactly. Typos do NOT throw — the variable silently keeps its
+// declared default.
+//
+// Per CLAUDE.md Tone — Lura is the warmth anchor for the arc, not a
+// co-griever. Specific. Intermittent. Sometimes funny. She is the contrast
+// to the gardener-keeper voice; she does not lament with the player.
+// She brings news from outside the wall, on her own time.
+
+VAR fragment_count = 0
+VAR last_plant_type = ""
+
+== arrival ==
+
+Oh. You're already here.
+
+I thought it'd take longer. The wall held, then. Good.
+
+{ last_plant_type == "rosemary":
+    Rosemary. Of course rosemary. My grandmother kept some in a coffee can on the porch and it outlived two of her dogs.
+- else:
+  { last_plant_type == "yarrow":
+      Yarrow. There's an old saying about yarrow and I cannot for the life of me remember what it is. The forgetting is the joke, I think.
+  - else:
+    { last_plant_type == "winter-rose":
+        Winter-rose, on the first try. You don't mess around. Most people start small.
+    - else:
+        Something grew. That's a start. That's not nothing.
+    }
+  }
+}
+
+I won't keep you. I just wanted to see it for myself.
+
+I'll come back when there's more to come back for.
+
+-> END