Phase 5: Discovery map render in continue-epic

[leeovery]

Summary

Phase 5 of the inception/discovery-map initiative — makes the discovery map visible in /continue-epic.

• New discovery_map[] field in discovery output, alongside next_phase_ready
• Per-topic lifecycle computed from inception + research + discussion items (tier-sorted: → ◐ ✓ ○ ⊘, alphabetical within tier)
• Discovery Map block at top of state display with summary line + convergence callout
• Menu collapses per-phase entries into per-topic entries with auto-routing (Start research for…, Continue X — research, etc.)
• Recommendation logic flips by convergence_state: discovery topmost during in-progress, build-phase items once settled
• New f/refine menu entry → /workflow-inception-entry epic {wu} (no behaviour yet — Phase 6 wires refinement)
• p/pending removed unconditionally; Section G dropped
• Legacy fallback render preserved for epics with no discovery_map

Test plan

• node --test tests/scripts/test-discovery-for-continue-epic.cjs — 73 tests pass (52 existing + 21 new)
• bash tests/scripts/test-workflow-manifest.sh — 214/214 still pass
• Manual smoke: fresh inception → continue-epic → map renders, all ○, summary N topics — N fresh
• Manual smoke: research-in-progress topic shows ◐ tier with Continue X — research
• Manual smoke: research completed → topic shows → ready for discussion, (recommended)
• Manual smoke: all decided → ✓ Discovery settled — ready for specification
• Manual smoke: f/refine routes to /workflow-inception-entry
• Manual smoke: legacy epic without inception items → no map block, existing tree renders, p/pending absent
• Manual smoke: m/map (pipeline view) unchanged

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