agents: own Llama cleanup tasks

[yisding]

Problem

LlamaAgentsBridge kept synchronous-reset cleanup in a hand-managed task set and created bounded handler-cancel work with asyncio.ensure_future. The former duplicated scope bookkeeping; the latter could survive its deadline without a bridge-local owner.

Changes

• add separate named task scopes for reset cleanup and bounded handler cancellation
• route local handler, local stream, and remote handler reset work through stable task identities
• retain bounded cancel survivors without making aclose() wait past their deadline
• join and release reset cleanup ownership from aclose()
• add a hard-timeout survivor ownership regression
• update local and remote reset tests to assert named scope membership
• reduce the raw production task baseline from 22 to 20
• document bridge cleanup ownership

Why / impact

Reset and cancellation behavior stay best-effort and keep the same timeout. Cleanup work is now explicitly attached to the bridge, while the two scopes preserve the important distinction between reset work that aclose() must join and cancellation work that may outlive the bounded wait.

Checks

• .venv/bin/python -m pytest tests/integrations/agents/test_llama_agents_bridge_cancellation.py tests/integrations/agents/test_llama_agents_bridge_local.py tests/integrations/agents/test_llama_agents_bridge_remote.py -q (45 passed)
• .venv/bin/python -m pytest tests/integrations/agents -k 'llama or lifecycle_credential_free' -q (66 passed, 2 skipped)
• .venv/bin/python -m pytest tests/ratchets/test_source_inventory.py tests/ratchets/test_teardown_budget_inventory.py -q (16 passed)
• focused Ruff and mypy checks
• pre-commit hooks

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