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Allow zeta2 to predict next cursor position along with edits #47916

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Allow zeta2 to predict next cursor position along with edits #47916

maxbrunsfeld wants to merge 6 commits into from
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@maxbrunsfeld maxbrunsfeld commented Jan 29, 2026

  • capture and store teacher model's predicted cursor position
  • provide cursor position to student during distillation
  • eval cursor positions
  • parse and apply cursor position predictions at runtime

Release Notes:

  • N/A

@maxbrunsfeld
Update example_spec.rs
2ce8e58
@maxbrunsfeld
Populate predicted cursor position in example
905c712
@maxbrunsfeld
Insert cursor marker into expected zeta2 output
98818f5
@maxbrunsfeld
Add cursor position scoring to edit prediction CLI
8d70071 
- Add cursor_distance and cursor_exact_match fields to ExampleScore
- Compute cursor metrics by comparing expected vs actual cursor positions
- For Teacher prompts, apply expected patch to editable region to find
  hunk offset, then compute expected cursor position relative to the
  editable region (matching how actual cursor offset is stored)
- Use cleaned patches from expected_patches_with_cursor_positions() to
  avoid issues with CURSOR_POSITION comment lines in patches
- Add cursor metrics to print_report() showing exact match (✓),
  distance (±N), miss (✗), or skipped (-)
- Add cursor_exact_match_rate, cursor_avg_distance, and
  cursor_total_evaluated to SummaryJson
- Make TeacherPrompt::extract_editable_region public for use in scoring
- Fix unwrap() panic in TeacherPrompt::parse when editable region not found
@cla-bot cla-bot bot added the cla-signed The user has signed the Contributor License Agreement label Jan 29, 2026
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@maxbrunsfeld