feat(engine): adopt memory-core as the one local engine (M2-C)

[vreshch]

What

Adopt @agentage/memory-core (^0.1.1, MIT) as the one local engine for the CLI (decision V11-C). The shipped FTS5/SQLite index engine is retired; every memory verb now runs over memory-core's git-per-vault local backend + federation router.

Why

One engine, everywhere. memory-core is the shared foundation (also under server-memory and the cloud MCP). The CLI stops carrying its own storage/index/edit code and its own config schema, and instead delegates to the published package. Net: -1120 lines, a smaller dependency surface, and byte-identical storage semantics with the rest of the product.

Config-format unification

• vaults.json is now the memory-core object-map shape: { $schema?, version: 1, vaultsDir?, autodiscover?, autoInit?, default?, vaults: { <name>: { path?, origin?: [{ remote, interval?, ignore? }], mcp? } } }. Validation is memory-core's validateConfig (rule: an entry needs origin and/or path).
• The CLI keeps ownership of the file lifecycle: scaffolding still injects the $schema link (https://agentage.io/schemas/vaults.schema.json), and saves stay atomic + 0600.
• YAML acceptance dropped - one format everywhere; the standalone @agentage/server-memory reads the same file and parses only JSON.
• couchdb vault type removed from the CLI surface (the unified schema has no per-vault type; account/sync vaults are deferred - do not invent fields memory-core does not validate).

Vault commands (unified shape)

• vault add <name> --local [path] writes { path } (path defaults to ~/vaults/<name>); --git <remote> writes { origin: [{ remote }] }. First vault added becomes default.
• vault remove <name> deletes the entry; if it was the default, the default is reassigned to a remaining vault (or cleared when none remain).
• vault reindex is gone (no index to rebuild).

Engine swap

DirectClient builds memory-core local backends + createRouter from the loaded config and delegates search/read/write/edit/delete/list. MemoryClient result shapes are now memory-core's contract types at full fidelity:

• search -> SearchResult (hits { path, title, snippet, score, updated } + nextCursor?)
• read -> MemoryView ({ path, title, frontmatter, body, tags, updated, deleted })
• write/edit -> WriteResult ({ path, rev, updated })
• list -> ListResult (folder-TREE with depth/tags)
• delete -> { path, deleted } (git rm + commit; recoverable from history)

@<vault>/<path> addressing and --vault both route through the router (--vault becomes an @-prefix). Human UX and flags are unchanged; --json prints the structured result.

Removals (retired FTS5 engine)

Deleted src/lib/{vault-index,vault-scan,vault-store,memory-edit,path-safety}.ts, src/commands/reindex.ts (+ tests), the vault reindex registration, and the node:sqlite bootstrap / --experimental-sqlite re-exec in src/cli.ts + the vitest execArgv entry. git grep needs no index.

R6 package guard

Amended minimally (sanctioned by V7/V11-C): the runtime-dep set is now @agentage/memory-core + chalk + commander + open (drops the direct yaml/zod). The forbidden-token binding is unchanged - still no daemon, no :4243, no native addons.

Verification

• npm run verify green (type-check + e2e type-check + lint + format + 118 unit tests + build).
• Coverage 86/83/71/88 (thresholds 65/70/70/70).
• Offline e2e tier green (vault-offline, memory-offline, m1-requirements) driving the built binary; the 6 memory verbs pass network-blackholed against a scratch vault, git-initted in place with a commit per mutation.
• Manual round trip through dist/cli.js in an isolated AGENTAGE_CONFIG_DIR: add -> write -> search -> read -> edit -> list -> delete, confirmed the vault folder became a git repo with write/edit/delete commits.

Do not merge until CI is green.

[github-actions]

🎉 PR Validation ✅ PASSED

Commit: 0c35e65918646788317c0446be09fe47d6a4c9ed
Branch: feature/m2c-memory-core-engine

Checks:

• ✅ Release guard (no version/changelog changes)
• ✅ Dependencies installed
• ✅ Type check passed
• ✅ Linting passed
• ✅ Format check passed
• ✅ Tests + coverage passed
• ✅ Build successful

Ready to merge! ✨

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⏰ Generated at: 2026-07-06T01:17:13.786Z