refactor(extensions): merge ttsr into guardrails
TTSR (Time Traveling Stream Rules) monitored streaming output against regex
patterns. Guardrails blocked dangerous actions and redacted secrets. Both are
safety/guardrail concerns — merging them into one extension reduces surface
area and simplifies the safety model.
Changes:
- Copied ttsr-rule-loader.js, ttsr-manager.js, ttsr-interrupt.md into guardrails/
- Updated guardrails extension-manifest.json with ttsr hooks (turn_start,
message_update, turn_end, agent_end)
- Integrated TTSR session_start/turn_start/message_update/turn_end/agent_end
handlers into guardrails/index.js
- Deleted ttsr/ extension directory
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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