Charley Cunningham 6fdeb1d602 Reuse guardian session across approvals (#14668) ...

## Summary
- reuse a guardian subagent session across approvals so reviews keep a
stable prompt cache key and avoid one-shot startup overhead
- clear the guardian child history before each review so prior guardian
decisions do not leak into later approvals
- include the `smart_approvals` -> `guardian_approval` feature flag
rename in the same PR to minimize release latency on a very tight
timeline
- add regression coverage for prompt-cache-key reuse without
prior-review prompt bleed

## Request
- Bug/enhancement request: internal guardian prompt-cache and latency
improvement request

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Co-authored-by: Codex <noreply@openai.com>

2026-03-15 22:56:18 -07:00

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