## What
- Internal Git helper commands now ignore configured hook directories
during repository bookkeeping.
## Why
- These helper flows should stay consistent even when a repository has
hook-directory configuration of its own.
## How
- Pass a command-local `core.hooksPath` override in the shared helper
path and the Git-info helper path.
- Add regressions for the baseline index rewrite flow and the metadata
status flow.
## Validation
- `cargo fmt --manifest-path
/Users/bookholt/code/codex/codex-rs/Cargo.toml --all --check`
- `cargo test --manifest-path
/Users/bookholt/code/codex/codex-rs/Cargo.toml -p codex-git-utils`
- `cargo test --manifest-path
/Users/bookholt/code/codex/codex-rs/Cargo.toml -p codex-core
test_get_has_changes_`
## Summary
- Remove `ghost_snapshot` / `GhostCommit` from the Responses API surface
and generated SDK/schema artifacts.
- Keep legacy config loading compatible, but make undo a no-op that
reports the feature is unavailable.
- Clean up core history, compaction, telemetry, rollout, and tests to
stop carrying ghost snapshot items.
## Testing
- Unit tests passed for `codex-protocol`, `codex-core` targeted undo and
compaction flows, `codex-rollout`, and `codex-app-server-protocol`.
- Regenerated config and app-server schemas plus Python SDK artifacts
and verified they match the checked-in outputs.
- create `codex-git-utils` and move the shared git helpers into it with
file moves preserved for diff readability
- move the `GitInfo` helpers out of `core` so stacked rollout work can
depend on the shared crate without carrying its own git info module
---------
Co-authored-by: Ahmed Ibrahim <219906144+aibrahim-oai@users.noreply.github.com>
Co-authored-by: Codex <noreply@openai.com>
