## Summary
- Adds `evaluate_tool_schema_compaction()` and
`generate_tool_schema_cases()` to `CompressionOnlyRunner`
- Four built-in cases cover the property-name vs annotation-key
distinction: `title`, `deprecated`, `readOnly`, and all four at once
- Each case asserts: byte count shrinks (annotations stripped), all
`must_preserve` property names survive in `properties`, no `required`
entry points to a stripped key, root-level schema annotations
(`$schema`, `title`) are dropped
- Wires the new eval into `.github/workflows/eval.yml` alongside the
existing CCR round-trip smoke step — runs on every PR touching
`headroom/transforms/**`, `headroom/evals/**`, or
`headroom/compress.py`, at zero API cost
## Motivation
PR #785 fixed a bug where the compaction pass stripped property *names*
that happened to match DROP_KEYS (e.g. a field literally called
`title`). This eval encodes the invariant that fix established so future
changes to the compaction logic can't silently regress it.
## Test plan
- [ ] `pytest
tests/test_evals_metrics.py::test_tool_schema_compaction_integrity` —
all 4 cases pass, `total_tokens_saved > 0`
- [ ] CI smoke step "Run tool schema compaction integrity eval (zero
cost)" passes with no API key required
## Real behavior proof
```
$ pytest tests/test_evals_metrics.py::test_tool_schema_compaction_integrity -v
PASSED [100%]
1 passed in 0.53s
```
Zero API calls, zero cost. Runs in under 1 second.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
`.gitattributes` declares `*.py text eol=lf` and `*.sh text eol=lf`, but
74 files (73 .py, 1 .sh) are stored in the index with CRLF line endings,
violating that contract. Every macOS/Linux clone reports these files as
"modified" on fresh checkout because git's diff engine sees the stored
bytes don't match the attribute contract, even though the working tree
and index match byte-for-byte.
Running `git add --renormalize .` rewrites each affected blob so the
stored form matches the attribute declaration. No semantic changes —
every affected file's diff is "N insertions, N deletions" with inserts
and deletes being the same lines modulo line endings.
Follow-up commit adds `.git-blame-ignore-revs` so `git blame` / GitHub
blame skip this mechanical commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
