skill: add /add-memory — semantic memory with RAG

[obekt]

Summary

Adds the /add-memory skill — a three-layer semantic memory system with RAG that gives container agents automatic recall of past conversations and stored facts.

This is a repackaging of PRs #560 and #561 as a standalone skill, following the feedback that the memory system is too complex for core but would work well as a skill.

What this skill does

• Core Memories — discrete facts/preferences stored by the agent via IPC, auto-injected into prompts when semantically relevant
• Conversation Memory — every message is embedded after each conversation; relevant past messages retrieved via RAG
• Archival Memory — session summaries searchable via memory_search
• Four IPC tools — memory_add, memory_update, memory_remove, memory_search

Uses sqlite-vec for vector search within the existing SQLite database and local embeddings via @huggingface/transformers (all-MiniLM-L6-v2) — no external API costs.

Skill type

Code modification — adds src/memory.ts and modifies src/db.ts, src/index.ts, src/ipc.ts, src/task-scheduler.ts.

Files

File	Purpose
SKILL.md	Installation guide with 4 phases
manifest.yaml	Skill metadata, deps, file lists
add/src/memory.ts	Complete memory system (3 layers, embeddings, RAG)
modify/src/db.ts	Load sqlite-vec extension, export getDb()
modify/src/index.ts	Init schema, RAG retrieval, conversation embedding, memory snapshots
modify/src/ipc.ts	Memory IPC handlers (add/update/remove/search)
modify/src/task-scheduler.ts	Inject memory context into scheduled tasks
tests/add-memory.test.ts	10 tests validating skill package structure

Testing

• Skill package tests pass (10/10)
• All modified files preserve upstream patterns (isMain, syncGroups, sender-allowlist, channel registry)
• Intent files document all changes and invariants
• Built against upstream/main (v1.2.6)

Dependencies

Package	Version
sqlite-vec	^0.1.7-alpha.2
@huggingface/transformers	^3.8.1

New environment variables

None

Supersedes

• feat: add three-layer semantic memory system with RAG #560 (feat: add three-layer semantic memory system with RAG)
• feat: inject memory context into scheduled tasks #561 (feat: inject memory context into scheduled tasks)

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