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-mid.ink

@@ -0,0 +1,31 @@
+// Lura, mid beat. After the player's 4th harvest (CONTEXT D-14).
+//
+// See lura-arrival.ink for variable contract + tone notes. Lura is the
+// warmth anchor: specific, slightly funny, never sentimental. She knows
+// something is happening to the world and she is choosing to be useful
+// about it instead of mournful.
+
+VAR fragment_count = 0
+VAR last_plant_type = ""
+
+== mid ==
+
+Four. That's a real number.
+
+I tried to do this once, you know. The garden, I mean. Not — not at this scale. A balcony. Three pots, one of them already broken when I bought it. The basil died first. The rosemary survived. The rosemary survives most things.
+
+You're keeping at it. Most people don't.
+
+{ last_plant_type == "winter-rose":
+    A winter-rose this time. They're harder. You can tell, can't you. They want a particular kind of attention.
+- else:
+  { last_plant_type == "yarrow":
+      Yarrow keeps giving you yarrow. There's a lesson in that and I'm not going to spell it out, that's the kind of thing you ruin by saying.
+  - else:
+      I'm going to be honest, I lost track of which one it was this time. They look different in the wall.
+  }
+}
+
+There's something I should be doing. I'll be back when there's more to bring you.
+
+-> END