denied retry fallback

[bearsyankees]

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[greptile-apps]

Greptile Summary

The PR adds configurable retry and pinning behavior that replays content-denied turns on a compatible fallback model.

• Adds fallback-model and denial-threshold settings with documentation.
• Validates provider-family and tool-schema compatibility before starting a scan.
• Derives fallback-specific model settings and persists per-agent denial state across snapshots.
• Adds coverage for retries, pinning, fallback settings, and snapshot restoration.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported provider, tool-schema, and model-settings incompatibilities are now guarded or configured independently for the fallback.

Important Files Changed

Filename	Overview
strix/config/models.py	Adds compatibility validation that rejects fallback models requiring a different provider credential path or tool schema.
strix/config/settings.py	Adds validated environment-backed settings for the fallback model and per-agent denial threshold.
strix/core/agents.py	Tracks, snapshots, and restores per-agent denial counts and permanent fallback state.
strix/core/execution.py	Replays denied turns using fallback-specific model configuration and pins agents after the configured threshold.
strix/core/runner.py	Validates fallback compatibility and configures independently derived fallback model settings during scan setup.
tests/test_denied_retry_fallback.py	Covers fallback replay, threshold pinning, disabled behavior, model settings, and snapshot restoration.

_{Reviews (6): Last reviewed commit: "fix: also reject a fallback model from a..." | Re-trigger Greptile}

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