chore(openspec): drop 9 superseded proposals + 11 stub archive files

Drop 9 batch proposals that are superseded by the boocode-lift-analysis
(boocontext-audit, conductor upgrades, self-healing/verify-gate skills):
add-3tier-memory, import-llm-evaluator, import-pregel-engine, plugin-platform,
conductor-evolution, code-intelligence-upgrade, dev-workflow, ui-overhaul,
agent-reliability.

Delete 11 stub archive files (49-66B each, 'Status: Shipped. Archived.' only)
that provide zero documentation value over the existing CHANGELOG.md + git tags.

openspec/changes/memory-context/tasks.md

@@ -0,0 +1,68 @@
+## 1. Implement ContextTier
+
+- [ ] 1.1 Create ContextTier class with token-budget summarization (max_tokens_before_summary: 16000)
+- [ ] 1.2 Implement RunningSummary tracking
+- [ ] 1.3 Add summary injection into system prompt on budget exceeded
+- [ ] 1.4 Add configurable thresholds and token counter
+
+## 2. Implement DailyTier
+
+- [ ] 2.1 Create DailyTier class with Markdown file management
+- [ ] 2.2 Implement lazy daily file creation (memory/YYYY-MM-DD.md)
+- [ ] 2.3 Implement append() with timestamped entries
+- [ ] 2.4 Add user-scoped variants (memory/users/{uid}/)
+- [ ] 2.5 Implement get_main_memory_file() for MEMORY.md
+
+## 3. Implement CoreTier
+
+- [ ] 3.1 Set up better-sqlite3 with FTS5 extension
+- [ ] 3.2 Create chunks table with vector BLOB column
+- [ ] 3.3 Create chunks_fts virtual table for full-text search
+- [ ] 3.4 Implement chunk storage with text chunker
+- [ ] 3.5 Implement hybrid search (vector 0.7 + keyword 0.3 with temporal decay)
+- [ ] 3.6 Implement fact storage with confidence scores
+
+## 4. Implement Deep Dream consolidation
+
+- [ ] 4.1 Create DeepDream class for overnight consolidation
+- [ ] 4.2 Read daily + core → LLM summarizes → overwrite MEMORY.md
+- [ ] 4.3 Implement dedup via content hashing
+- [ ] 4.4 Write dream diary to memory/dreams/YYYY-MM-DD.md
+- [ ] 4.5 Add cron scheduling
+
+## 5. Add memory management tools
+
+- [ ] 5.1 Implement manage-memory tool (create/update/delete)
+- [ ] 5.2 Implement search-memory tool (hybrid search)
+- [ ] 5.3 Register tools for agent use
+
+## 6. Add context compression (DCP)
+
+- [ ] 6.1 Implement range/message dedup
+- [ ] 6.2 Implement purge errors
+- [ ] 6.3 Implement turn protection
+- [ ] 6.4 Wire into compaction pipeline
+
+## 7. Add boulder state
+
+- [ ] 7.1 Implement cross-session plan persistence in Postgres
+- [ ] 7.2 Add automatic resumption on session start
+
+## 8. Add System Context model
+
+- [ ] 8.1 Implement typed context sources
+- [ ] 8.2 Implement immutable epoch baselines
+- [ ] 8.3 Add reconciliation on context change
+
+## 9. Add SWR caching
+
+- [ ] 9.1 Implement stale-while-revalidate for MCP tool results
+- [ ] 9.2 Add TTU-based revalidation
+- [ ] 9.3 Add cache invalidation on project switch
+
+## 10. UI: Memory & context
+
+- [ ] 10.1 Add memory browser UI
+- [ ] 10.2 Add context composition breakdown
+- [ ] 10.3 Add consolidation timeline
+- [ ] 10.4 Add cross-session continuity indicator