Follow-up to 564aef2946 (Mantle SigV4 on /model). The same class of bug covered the
other two Bedrock wires and two more rebuild paths:
- Claude on Bedrock (anthropic_messages): startup builds an AnthropicBedrock SDK
client (SigV4 via boto3). /model, fallback-to-Bedrock and fallback restore built a
plain Anthropic client with api_key="aws-sdk" against bedrock-runtime → 401/403.
- Converse models (bedrock_converse: Nova, DeepSeek, Llama): only agent_init set
_bedrock_region / _bedrock_guardrail_config. After a rebuild the transport fell
back to us-east-1 and guardrail_config=None, so eu-/ap- users hit the wrong region
and configured Guardrails silently dropped. switch_model also built a pointless
OpenAI client against bedrock-runtime.
Introduce bedrock_adapter.bind_bedrock_runtime(agent, base_url, api_mode) as the one
place that puts an agent on a non-Mantle Bedrock wire, and call it from agent_init
(replacing the two duplicated bodies), _build_switched_client, _rebuild_primary_client
and _swap_fallback_clients. try_recover_primary_transport had a hand-copied version of
_rebuild_primary_client's ladder (and would have hit the same gap); it now calls the
shared helper. The region/guardrail parsing that lived in agent_init and
runtime_provider_backends is now bedrock_region_from_runtime_url /
bedrock_guardrail_config in the adapter.
Live probe on origin/main across switch_model, restore_primary_runtime and
_swap_fallback_clients for both wires: 0/6 correct before, 6/6 after.
No runtime consumer read the proxy (terminal_tool/environments call is_interrupted()/set_interrupt()
directly); its only users were tests patching tools.interrupt._interrupt_event, which had no effect on
the code under test. tools/terminal_tool.py's own re-export of the name is owned by another worker.
For each issue anchor present in BASE 63279301bc non-test .py and absent on HEAD, the BASE comment/docstring block was re-attached at the HEAD location of the code it explained (matched by the distinctive code line / enclosing def). Sentences already covered by an existing HEAD comment were deduped; the issue number always survives. Insert-only: no code lines changed.
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