release: Forge v2.0 — MemPalace semantic memory integration

Major changes:
- Built-in MemPalace MCP server as memory backend (29 tools)
- Hybrid search (BM25 + vector, 96.6% recall) replaces grep on flat files
- Agent diaries, knowledge graph, auto-save hooks
- Graceful degradation: all agents fall back to memory/*.md if MemPalace unavailable
- Python auto-detection (python/python3) + winget auto-install on Windows
- Mac sed compatibility for settings.json patching
- Token optimizations: conditional palace search (L2+), AGENTS.md lazy-loaded
- 4 new hooks: mempal-save, mempal-precompact, detect-gaps, check-blockers
- Rewritten agents: dream, retro (palace-native + fallback)
- Updated agents: pm, developer, reflect, onboarding (palace integration)
- install.sh: full preset EXIT 0 verified, empty extension dirs handled
- 6 audit rounds, 11 auditors, all issues resolved

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

release: Forge v1.0

- Bump version to 1.0.0 across all files
- Add retro agent to README (37 agents total)
- Update agent counts in README and structure docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>