Previously ACP dangerous-command approvals mixed an invalid ACP
payload shape with partial Hermes option mapping, and the callback
plumbing was shared across worker threads. This commit uses ACP
tool-call updates, preserves Hermes once/session/always semantics,
and scopes approval callbacks to the current worker thread.
- Build permission requests with `update_tool_call` and unique
`perm-check-*` ids in `acp_adapter/permissions.py`
- Keep ACP option mapping explicit and fail closed on unknown outcomes
or request failures
- Set approval callbacks inside the ACP executor worker and read them
from thread-local state in `tools/terminal_tool.py`
- Replace duplicated ACP bridge coverage with focused tests in
`tests/acp/test_permissions.py` and add a thread-local callback test
31b4721791