feat(puppy_kennel): kennel_forget + kennel_update tools + fix /kennel search scope bug

[SrividyaGanapathi]

Summary

• kennel_forget(drawer_id) — permanently delete a drawer by ID. Returns a preview of the deleted content so the agent can confirm it removed the right memory. FTS index stays in sync automatically via the existing drawers_ad trigger in schema.py.

• kennel_update(drawer_id, new_content) — replace a drawer's content in-place by ID. FTS index updated automatically via the drawers_au trigger. Both tools follow the same pattern as the existing five kennel tools: pydantic BaseModel output, @agent.tool decorator, never raises.

• Bug fix: /kennel search hardcoded agent name — _cmd_search was calling default_recall_scope("code-puppy", ...) regardless of the active agent, so any agent other than the default would never see its own agent:<name> wing in search results. Fixed by resolving the active agent via get_current_agent_name() with a safe fallback to "code-puppy".

Design rationale

kennel_forget and kennel_update are intentionally ID-based rather than query-based. The agent workflow is: call kennel_recall to find the relevant drawer (BM25 handles ranking), read the returned id, then call kennel_forget/kennel_update with that ID. This keeps deletion unambiguous, reuses the existing retrieval path, and avoids duplicating search logic inside the mutation tools.

Test plan

• test_kennel_forget_deletes_existing_drawer — drawer removed, count goes to 0
• test_kennel_forget_missing_id_returns_error — graceful error, found=False
• test_kennel_forget_content_preview_truncated_at_200 — preview capped at 200 chars
• test_kennel_update_replaces_content — new content in storage, old gone
• test_kennel_update_missing_id_returns_error — graceful error
• test_kennel_update_empty_content_returns_error — rejected before hitting DB
• test_kennel_update_fts_index_reflects_new_content — BM25 finds new term, not old
• test_register_tools_callback_exposes_full_surface — updated to include both new tools
• ruff check + ruff format --check — clean

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