Adds three lightweight per-turn detectors that fire corrective user
messages back into the conversation when the model goes off the rails:
- RepetitionDetector: sliding-window scan over streamed text deltas;
trips when a 50/80/120-char pattern repeats >= 3 times in the trailing
200 chars. Breaks the active stream and injects a correction.
- PatchFailureTracker: per-path counter for fs.edit/fs.write failures;
trips on the 4th consecutive failure and steers the model to fs.write
rather than another fs.edit on the same path. Success decrements with
a floor of 0; paths are isolated.
- DetectGreeting: narrow allowlist for "how can I help" style replies;
only consulted after a round that used tools, so first-turn greetings
don't false-positive.
Detector state is per-turn (declared locally in runLoop), single-
goroutine use. Corrective messages are appended as user-role text to
both engine history and the context window. Telemetry: each trigger
logs at INFO with round + path where applicable.
Covered by 12 unit tests for the primitives and 5 loop-level integration
tests that drive the full agentic loop via the existing eventStream
mock.
