Fix Bedrock replay of historical tool names

[raphael]

Summary

• build one request-scoped Bedrock name map from both advertised tools and canonical tool names already present in transcript history
• require every historical tool_use block to use that map instead of falling back to the raw canonical name
• reject sanitized-name collisions before sending the provider request

Why

A resumed agent can retain a valid historical tool call after that tool leaves the current turn's catalog. Canonical names commonly contain dots, while Bedrock only accepts [a-zA-Z0-9_-]+. Replaying the canonical name unchanged therefore produced a provider ValidationException and failed otherwise valid multi-step runs.

This keeps the ownership boundary explicit: transcripts remain canonical, and the Bedrock adapter performs all provider-specific name translation.

Test plan

• make lint
• make test
• regression coverage for a history-only dotted name
• regression coverage for collisions between current and historical names