Extract shared init logic (pragmas, schema creation, agent registration)
into IpcDb::init(), eliminating ~45 lines of duplication between open()
and open_with_id(). Extract SQL strings into PRAGMA_SQL and SCHEMA_SQL
constants for single source of truth. Remove unused (i64, Value) tuple
in AgentsInboxTool by collecting directly into Vec<Value>.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add 5 LLM-callable IPC tools (agents_list, agents_send, agents_inbox,
state_get, state_set) backed by a shared SQLite database, enabling
independent ZeroClaw processes on the same host to discover and
communicate with each other. Gated behind [agents_ipc] enabled = true.
Related #88 (item 3: Sessions / Sub-Agent Orchestration)
Related #1518 (design spec)
Mike-7777777