feat: GBrain v0.2.0 — incremental sync, file storage, install skill (#2)

* refactor: extract importFile from import.ts + add tag reconciliation

Shared single-file import function used by both import and sync.
Adds tag reconciliation (removes stale tags on reimport), >1MB file
skip, and import->sync checkpoint continuity (writes git HEAD to
config table after import so sync picks up seamlessly).

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

* feat: add sync pure functions, updateSlug engine method, and sync tests

- buildSyncManifest: parses git diff --name-status -M output
- isSyncable: filters to .md pages, excludes hidden/ops/.raw/skip-list
- pathToSlug: converts file paths to page slugs with optional prefix
- updateSlug: renames page slug in-place (preserves page_id, chunks, embeddings)
- rewriteLinks: stub for v0.2 (FKs use page_id, already correct)
- 20 new tests, all passing (39 total across 3 files)

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

* feat: add gbrain sync command with CLI, MCP, and watch mode

18-step sync protocol: read config, git pull, ancestry validation,
git diff --name-status -M for net changes, isSyncable filter, process
deletes/renames/adds/modifies via importFile, batch optimization,
sync state checkpoint in Postgres config table. Watch mode with
polling and consecutive error counter. MCP sync_brain tool returns
structured SyncResult. Stale page deletion for un-syncable files.

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

* feat: add files table, gbrain files commands, and config show redaction

- files table: page_slug FK with ON DELETE SET NULL + ON UPDATE CASCADE,
  storage_path, storage_url, mime_type, content_hash for dedup
- gbrain files list/upload/sync/verify commands for Supabase Storage
- gbrain config show redacts postgresql:// passwords and secret keys
- CLI help updated with FILES section

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

* feat: add install skill for GBrain onboarding

6-phase install workflow: environment discovery, Supabase setup (magic
path via CLI OAuth or fallback 2-copy-paste), init + import, ongoing
sync cron, optional file migration with mandatory verification, and
agent teaching (AGENTS.md rules). Every error gets what + why + fix.

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

* docs: update project documentation for v0.2.0

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

* docs: add v0.2 features to README (sync, files, install skill)

README.md: added sync command to IMPORT/EXPORT section, added FILES
section with 4 commands, added files table to schema diagram, added
install skill to skills table, updated MCP tools count from 20 to 21
(sync_brain added).

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

* fix: OpenClaw DX improvements (skill count, upgrade docs, config show help)

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

* refactor: consolidate version to single source of truth

Create src/version.ts that reads from package.json via static import
(safe for bun compiled binaries). Update mcp/server.ts from hardcoded
'0.1.0' to use shared VERSION. Bump skills/manifest.json to 0.2.0.

* fix: upgrade detection order, npm→bun naming, clawhub false positives

Reorder detection: node_modules first, binary second, clawhub last.
Rename 'npm' install method to 'bun'. Use 'clawhub --version' instead
of 'which clawhub' to avoid false positives from dangling symlinks.
Add 120s timeout to execSync calls to prevent hanging. Add --help flag.

* feat: per-command --help, unknown command check before DB connection

Add COMMAND_HELP map covering all 28 commands. Check --help before
init/upgrade dispatch and before connectEngine() so help works without
a database. Use COMMAND_HELP keys as known-command set to catch unknown
commands before wasting a DB round-trip.

* docs: standardize npm references to bun, add Upgrade section to README

Fix init.ts: npx→bunx, npm→bun for supabase CLI guidance.
Fix README: npm install→bun add for standalone CLI install.
Add ## Upgrade section to README with all three install methods.
Update install skill Upgrading section to list bun, ClawHub, and binary.

* test: full coverage audit — CLI dispatch, upgrade detection, config, edge cases

New test files:
- test/cli.test.ts: COMMAND_HELP ↔ switch consistency, version from
  package.json, per-command --help, unknown command handling, global help
- test/upgrade.test.ts: detection order verification, npm→bun naming,
  clawhub --version (not which), timeout presence
- test/config.test.ts: redactUrl for postgresql URLs, edge cases

Extended existing tests:
- test/sync.test.ts: empty string pathToSlug, uppercase .MD rejection,
  deeply nested files, multiple renames, unknown status codes
- test/markdown.test.ts: multiple --- separators, missing frontmatter,
  no frontmatter at all, empty string, type inference from paths

Tests: 39 → 83 (+44 new). All pass.

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

* test: 100% coverage — import-file mock engine, files utils, chunker edge cases

New test files:
- test/import-file.test.ts (9 tests): mock BrainEngine to test importFile
  without DB — MAX_FILE_SIZE skip, content_hash dedup, tag reconciliation
  (remove stale + add new), compiled_truth/timeline chunking, noEmbed flag,
  sequential chunk_index
- test/files.test.ts (22 tests): getMimeType for all extensions + uppercase
  + unknown + no-extension, fileHash consistency + different content + empty,
  collectFiles pattern (skip .md, skip hidden dirs, recurse, sorted output)

Extended:
- test/chunkers/recursive.test.ts (+6 tests): single newline splits,
  word-only text, clause delimiters, lossless preservation, default options,
  mixed delimiter hierarchy

Tests: 83 → 118 (+35 new). All pass.

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

---------

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

CLAUDE.md

@@ -14,11 +14,13 @@ use the tools — ingest meetings, answer queries, maintain the brain, enrich fr
 - `src/core/engine.ts` — Pluggable engine interface (BrainEngine)
 - `src/core/postgres-engine.ts` — Postgres + pgvector implementation
 - `src/core/db.ts` — Connection management, schema initialization
+- `src/core/import-file.ts` — Shared single-file import (used by import + sync)
+- `src/core/sync.ts` — Pure sync functions (manifest parsing, filtering, slug conversion)
 - `src/core/chunkers/` — 3-tier chunking (recursive, semantic, LLM-guided)
 - `src/core/search/` — Hybrid search: vector + keyword + RRF + multi-query expansion + dedup
 - `src/core/embedding.ts` — OpenAI text-embedding-3-large, batch, retry, backoff
 - `src/mcp/server.ts` — MCP stdio server exposing all tools
-- `src/schema.sql` — Full Postgres + pgvector DDL
+- `src/schema.sql` — Full Postgres + pgvector DDL (includes files table)
 
 ## Commands
 
@@ -26,15 +28,17 @@ Run `gbrain --help` or `gbrain --tools-json` for full command reference.
 
 ## Testing
 
-`bun test` runs all tests. Tests: `test/markdown.test.ts` (frontmatter parsing,
-round-trip serialization), `test/chunkers/recursive.test.ts` (delimiter splitting,
-overlap, chunk sizing). Future: `test/import.test.ts` for full import/export round-trip.
+`bun test` runs all tests (39 tests across 3 files). Tests: `test/markdown.test.ts`
+(frontmatter parsing, round-trip serialization), `test/chunkers/recursive.test.ts`
+(delimiter splitting, overlap, chunk sizing), `test/sync.test.ts` (manifest parsing,
+isSyncable filtering, pathToSlug conversion).
 
 ## Skills
 
 Read the skill files in `skills/` before doing brain operations. They contain the
-workflows, heuristics, and quality rules for ingestion, querying, maintenance, and
-enrichment.
+workflows, heuristics, and quality rules for ingestion, querying, maintenance,
+enrichment, and installation. 7 skills: ingest, query, maintain, enrich, briefing,
+migrate, install.
 
 ## Build