feat(omp): add Oh My Pi extension plugin

[JackieJK]

feat(omp): add Oh My Pi extension plugin

Add a new omp integration with 15 lifecycle hooks, bringing it from zero
to surpassing Pi integration parity and approaching OpenCode plugin
capability where omp's ExtensionAPI permits.

Problem

agentmemory had no omp integration. The existing Pi integration
(integrations/pi/) uses @mariozechner/pi-coding-agent which is
incompatible with omp's fork (@oh-my-pi/pi-coding-agent). As a result:

• Zero observation coverage — omp sessions produced no memory data
• No session lifecycle — no /session/start or /session/end calls
• No smart-search recall — no memory injection into system prompts
• No per-tool granularity — no tool-level observation capture

Changes

Hook	API call	Origin
session_start	POST /session/start	PR #604
before_agent_start	POST /smart-search + POST /observe	Pi integration
tool_call	stash file paths for enrichment	Claude pre-tool-use pattern
tool_result	POST /observe	PR #604
context	truncation + POST /enrich (opt-in)	omp-only
session_before_compact	POST /context (cache)	PR #604
session.compacting	inject cached context	omp-only
agent_end	POST /observe	Pi integration
session_shutdown	drain → summarize → session/end → optional consolidation	PR #604
tool_approval_requested	POST /observe	omp-only
tool_approval_resolved	POST /observe	omp-only
auto_compaction_start	POST /observe	omp-only
auto_compaction_end	POST /observe	omp-only
auto_retry_start	POST /observe	omp-only
auto_retry_end	POST /observe	omp-only

Also registers 3 tools (memory_health, memory_search, memory_save)
and 1 command (/agentmemory-status) via omp's ExtensionAPI with zod
schemas.

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