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>

tui/monitor.tsx

@@ -24,6 +24,7 @@
 import React, { useEffect, useReducer, useState } from "react";
 import { render, Box, Text, useApp, useInput, useStdout } from "ink";
 import { createIpcClient } from "./ipc-client.js";
+import { formatStatusSegments } from "./format.js";
 import { EVENT_TYPES } from "../runtime/ipc-protocol.js";
 import { stateDir } from "../runtime/config.js";
 import { initKnowledge, isAvailable as knowledgeReady, recentRecommendations, listImprovements, recommendationStats } from "../runtime/knowledge/index.js";
@@ -215,6 +216,21 @@ function StatusHeader({ snapshot, connectedIpc, width, startedAt }: { snapshot:
 					</>
 				) : null}
 			</Box>
+			{/* What / why / blocked / stalled — per-tick observability the bot
+			    already computes (runtimeState, lastReflex, activeSkill, blockedBy,
+			    noProgressReason); assembled by the pure formatStatusSegments helper
+			    so it stays unit-testable off ink. */}
+			{(() => {
+				const segs = formatStatusSegments(snapshot);
+				if (segs.length === 0) return null;
+				return (
+					<Box>
+						{segs.map((s, i) => (
+							<Text key={i} color={s.color} dimColor={s.dimColor} bold={s.bold}>{s.text}</Text>
+						))}
+					</Box>
+				);
+			})()}
 		</Box>
 	);
 }