feat(v0.4.1): make the Settlement Contract honest end-to-end

Patches each link of the closed-loop chain (world-truth -> invariant ->
dispatch -> worldDelta -> milestone) so the contract can no longer advance
on a lie or stall on an unreachable milestone, and surfaces the result on
the monitor.

- Unblock M6_lighting: add gather.coal producer (mirrors gather.stone,
  strict expectGain), register it, add the skill-graph node, and make
  curriculum.shelter.torch two-step (gather coal -> craft torch). craft.torch
  needed coal but no skill produced it, so the contract pinned on M6 forever
  and starved M7/M8/M9. One curriculum edit fixes both rails.
- M8 no longer falsely satisfied: build-shelter records locations.shelter
  only on real progress (setLocation moved below the no_progress guard).
- M2_bed made monotonic: sleepInBed writes locations.bed when the bot places
  its own bed, so M2 stays met after the carried bed item is consumed.
- Observability: new ink-free tui/format.js helper renders per-tick
  state / firing rail / active skill / blocked prerequisite / stall reason
  in the monitor header (fields bot.js already computes but never showed).
- Harden the valid-skill-id guardrail: skillRegistryPrompt preserves the
  "NEVER invent" footer when truncating (a growing registry was dropping it),
  and fix the stale "tech-tree > autonomous" reflex chain in the escalation
  prompt.

Tests: 494/494 passing; new build-shelter / invariants / format suites plus
skill-graph, curriculum, skill-registry cases. lint-patch clean. Deferred
audit findings recorded in plans/v0.4.0-vnext.md (local).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

runtime/curriculum.js

@@ -181,7 +181,16 @@ const MILESTONES = [
 		id: "shelter.torch",
 		title: "Have torches on hand for the perimeter",
 		isDone: (inv) => has(inv, "torch", 4),
-		suggest: () => ({ skillId: "craft.torch" }),
+		// Two-step like wood.planks-and-sticks: torches need coal (or
+		// charcoal), but nothing else produces it — without this the
+		// milestone pinned forever on craft.torch's missing_material. Mine
+		// coal first, then craft. The contract's M6_lighting delegates
+		// suggest() to this milestone, so this edit fixes both rails.
+		suggest: (inv) => {
+			const fuel = (inv?.coal ?? 0) + (inv?.charcoal ?? 0);
+			if (fuel < 1) return { skillId: "gather.coal" };
+			return { skillId: "craft.torch" };
+		},
 	},
 	{
 		id: "village.base-site",