feat(marketing): HoM feature-spotlight X drafts + brand-voice charter (v0.18.0 B)

The Head of Marketing now markets features, not just releases: a default-off
x_feature_spotlight loop periodically spawns the HoM to investigate what shipped
(CHANGELOG, feature flags, docs/map, KB) and draft ONE held marketing post via
propose_feature_spotlight, reviewed in the X post queue.

- New x_feature source (distinct from x_post, fixing panel mislabeling) + a
  panel Feature-spotlight branch.
- brand_voice column on company_goals (migration 061, single head) as the
  CEO-editable voice source, surfaced in Settings and injected into the HoM
  briefing; a VOICE GUIDE baseline in head-marketing.md.
- propose_feature_spotlight verb (HoM-only), mirroring propose_roadmap.

Gated by x_feature_spotlight_enabled (default off; flag-off dormancy proven).
Also fixed two real bugs found mid-build: company_goals API schemas dropped
brand_voice on GET/PUT; the live charter UI is goals-tab.tsx, not the unmounted
company-goals-card.tsx. Full suite green (2935); migration single-head verified.

Makefile

@@ -551,6 +551,10 @@ foundation-check:
 	@$(MAKE) lifecycle
 	@git diff --exit-code -- docs/rag/lifecycle panel/lib/lifecycle.json agents/prompts/_generated/lifecycle-*.md \
 		|| (echo "Lifecycle artifacts are out of date. Run 'make lifecycle' and commit the diff." && exit 1)
+	@echo "==> verb tables up-to-date (renders + git diff)"
+	@uv run python scripts/regenerate_verb_tables.py
+	@git diff --exit-code -- agents/prompts/_generated/ ':!agents/prompts/_generated/lifecycle-*.md' \
+		|| (echo "Verb tables are out of date. Run 'uv run python scripts/regenerate_verb_tables.py' and commit the diff." && exit 1)
 	@echo "==> postgres enum parity (skip if no migrated DB)"
 	uv run python scripts/verify_postgres_enums.py
 	@echo "All foundation drift checks passed."