feat(runtime): early-game survival curriculum + stone/craft skills (Phase 3) (#15)

Phase 3 of plans/autonomous-survival-bot-prd.md. Gives the bot a
deterministic path from empty inventory through stone-tier tools and
basic storage, without an LLM call per tick.

New:
- runtime/curriculum.js: ordered milestone chooser
  (wood.16 → wood.planks-and-sticks → wood.tools → stone.32 →
   stone.tools → food.basic → storage.chest → shelter.torch). Each
  milestone exposes isDone(inventory, snapshot) and suggest() returning
  a { skillId } plan the scheduler can dispatch via runSkill. isDone
  uses "stage reached" escapes so progress is monotonic — crafting
  planks doesn't bounce the chooser back to "gather 16 logs".
- runtime/skills/gather-stone.js: gather.stone with pickaxe-required
  precondition, blacklist on failed paths, registry-aware matching
  (stone / cobblestone / deepslate / cobbled_deepslate / andesite /
  diorite / granite).
- runtime/skills/craft.js: factory + concrete skills for craft.planks,
  craft.sticks, craft.wooden-axe/-pickaxe/-sword, craft.stone-axe/
  -pickaxe/-sword, craft.furnace, craft.chest, craft.torch (torch
  requires coal or charcoal preflight).

Tests:
- runtime/curriculum.test.js: 14 tests covering chooser ordering,
  per-milestone skill suggestion, inventoryFull threshold, monotonic
  advancement across stage transitions.
- npm test now runs the full suite: 28/28 passing.

Wiring:
- runtime/bot.js: lastSnapshot.curriculum carries the next milestone
  + suggested skill on every tick; lastSnapshot.currentMilestone
  prefers the curriculum title over the planner.md line.
- tui/tui.tsx: milestone line shows the curriculum's suggested skill
  and an [inventory full] flag when isInventoryFull fires.

Reflex.js still calls actions.js directly; wiring the scheduler to
runSkill(plan.skillId, …) lands in Phase 4.

Co-authored-by: Yuriy Mayatnikov <mayatnikov@me.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -16,7 +16,7 @@
     "tui": "tsx tui/tui.tsx",
     "propose:apply": "node scripts/propose-apply.js",
     "stop": "bash scripts/stop.sh",
-    "test": "node --test runtime/skills/contract.test.js runtime/skills/groups.test.js"
+    "test": "node --test runtime/skills/contract.test.js runtime/skills/groups.test.js runtime/curriculum.test.js"
   },
   "dependencies": {
     "dotenv": "^16.4.5",