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/skill-registry.js

@@ -45,9 +45,14 @@ export function describeSkill(id) {
 }
 
 // Human-readable block to drop into LLM system prompts. Groups by
-// namespace, lists "id — title (timeoutMs)". Capped at ~2KB to stay
-// well within the model's instruction window.
-export function skillRegistryPrompt({ limit = 2000 } = {}) {
+// namespace, lists "id — title". Capped at ~2KB to stay well within the
+// model's instruction window. When the list overflows the cap we truncate
+// the LIST, never the footer — the footer carries the load-bearing
+// guardrail ("NEVER invent new ids"), the whole reason this prompt exists.
+// A naive tail-slice (the pre-v0.4.1 behaviour) would silently drop that
+// guardrail once the registry grew past the cap, re-opening the exact v0.2
+// skill-id hallucination this module was built to close.
+export function skillRegistryPrompt({ limit = 3000 } = {}) {
 	const { byNamespace } = get();
 	const namespaces = Array.from(byNamespace.keys()).sort();
 	const lines = ["Valid skill ids (USE ONLY THESE for avoid_skill / prefer_skill):"];
@@ -58,10 +63,13 @@ export function skillRegistryPrompt({ limit = 2000 } = {}) {
 			lines.push(`    - ${s.id} — ${s.title ?? s.id}`);
 		}
 	}
-	lines.push("");
-	lines.push("If no listed skill fits, set the field to null. NEVER invent new ids.");
-	const text = lines.join("\n");
-	return text.length > limit ? text.slice(0, limit - 4) + "\n..." : text;
+	const body = lines.join("\n");
+	const footer = "If no listed skill fits, set the field to null. NEVER invent new ids.";
+	const full = `${body}\n\n${footer}`;
+	if (full.length <= limit) return full;
+	const sep = "\n...\n\n";
+	const room = Math.max(0, limit - footer.length - sep.length);
+	return `${body.slice(0, room)}${sep}${footer}`;
 }
 
 // For tests / hot-reload scenarios.