feat!: v2.0.0 native cutover — memory runs on amplifier-data; mempalace removed (tool memory, local embedder, auto-started daemon, migration script)

## B1 Core Architecture

- FastEmbedEmbedder: local all-MiniLM-L6-v2 ONNX (384-dim), daemon-side embeddings. Zero external calls — model stays on-machine. Fallback lexical search when embedder unavailable (loud, never silent).
- Gateway promoted to auto-started daemon via MemoryClient.ensure_daemon(): daemon.json discovery + /health polling, O_EXCL spawn race prevention, stale-pid + kill-9 recovery, version-mismatch respawn. Production stores require durable daemon (enforced).
- Daemon-side search: cosine similarity top-k + lexical bonus scoring. Lexical-only degraded mode when embedder is offline — returns results with warning, never blocks.

## B2 Cutover

- Every tool operation (write_cell, relate, assert_fact, invalidate_fact) + capture/briefing/interject hooks rewired from mempalace-mcp subprocess to native MemoryClient daemon.
- mempalace dependency removed from all pyproject.toml files; PalaceMemoryStore, DualWriteMemoryStore, dualwrite_compare scripts deleted.
- amplifier-data (pinned 09482f1) + fastembed now HARD deps of tool-memory. No fallback to non-native stores.

## B3 Sweep

- Modules renamed: tool-mempalace → tool-memory, hooks-mempalace-* → hooks-memory-*.
- Packages renamed: amplifier_module_tool_mempalace → amplifier_module_tool_memory.
- Tool renamed: palace → memory (operations unchanged).
- Classes renamed: PalaceTool → MemoryTool, AmplifierDataMemoryStore → NativeMemoryStore.
- Scripts: memory_store.py → store.py, gateway.py → daemon.py.
- Behaviors: behaviors/mempalace.yaml → behaviors/memory.yaml.
- External SQLite tool-memory module dropped (name collision, duplicative).
- Home directory: ~/.mempalace → ~/.amplifier/memory.
- Events schema v2: memory:* event names.
- Skills: skills/mempalace → skills/memory.
- Console scripts: memory-daemon, amplifier-memory-import, etc.
- Migration script migrate.py: chromadb-only [migrate] extra, reads legacy store read-only, copies vectors verbatim, idempotent --verify gate.
- CHANGELOG.md updated for v2.0.0 breaking changes.

## Killer Gates Executed

✅ KG-N1: Real semantic remember→search round-trip through orchestrator calling convention
✅ KG-N2: Two-process concurrent writers via auto-started daemon
✅ KG-N3: Embedder-offline lexical degraded mode (loud, operational)
✅ KG-N4: Vendor-sweep allowlist reviewed + grepped (no mempalace imports remain outside deleted files)
✅ KG-N5: Migration from real seeded chromadb store (idempotent, vectors preserved)
✅ KG-N6: kill -9 daemon respawn under stale-pid conditions

## Test Results

- tool-memory: 259 passed
- hooks-capture: 5 passed
- briefing: 12 passed
- interject: 23 passed
- repo-root: 113 passed
- Total: 412 passed with mempalace NOT installed (conftest-asserted)
- ruff: clean
- pyright: 0 new errors, no new suppressions

Generated with [Amplifier](https://github.com/microsoft/amplifier)

Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

Author: michaeljabbour