fix: add post-rebase uv-sync hook to prevent stale uv.lock after restack

[ichoosetoaccept]

Closes DOT-471

Summary

• Add uv-sync hook on post-checkout, post-merge, and post-rewrite stages to both prek.toml and the generated template (project/prek.toml.jinja)
• Add post-checkout, post-merge, post-rewrite to default_install_hook_types so prek wires up the git hook shims

Problem

When a stacked branch is restacked onto a base that changed pyproject.toml (e.g. version bump), uv.lock becomes stale. The uv-lock pre-commit hook only fires when pyproject.toml or uv.lock are in the changeset — so after rebase it skips and CI fails with a version mismatch.

Note

Users of the template need to re-run prek install after pulling this change to register the new git hook stages.

[ichoosetoaccept]

This change is part of the following stack:

• fix: add post-rebase uv-sync hook to prevent stale uv.lock after restack #300 ◀

_{Change managed by git-spice.}

[linear]

DOT-471 Add post-rebase uv-sync hook to prevent stale uv.lock after restack

[greptile-apps]

Greptile Summary

This PR adds uv-sync as a post-checkout/post-merge/post-rewrite hook to both prek.toml (this repo) and project/prek.toml.jinja (generated projects), and extends default_install_hook_types with post-merge and post-rewrite so prek installs those hooks. This ensures uv sync runs automatically after rebases (including restacks), merges, and branch switches, keeping the venv and uv.lock consistent. Both dual configs are updated in sync, as required.

Confidence Score: 5/5

Safe to merge — correct implementation with both dual configs updated and no functional issues found.

Changes are straightforward, consistent between the two config files, and technically correct. post-rewrite is the right git hook type for post-rebase scenarios (git has no post-rebase hook). No blocking issues.

No files require special attention.

Important Files Changed

Filename	Overview
project/prek.toml.jinja	Adds post-merge and post-rewrite to default_install_hook_types and expands the uv-pre-commit hooks block to include uv-sync running on those stages plus post-checkout.
prek.toml	Mirror of the template change — post-merge and post-rewrite added to default_install_hook_types and uv-sync added with the same stages, satisfying the dual-config requirement from CLAUDE.md.

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Git as Git
    participant prek as prek hooks
    participant UV as uv

    Dev->>Git: git rebase / git commit --amend
    Git-->>prek: post-rewrite (fires after rewrite)
    prek->>UV: uv sync
    UV-->>Dev: venv updated, uv.lock fresh

    Dev->>Git: git checkout / git pull (merge)
    Git-->>prek: post-checkout / post-merge
    prek->>UV: uv sync
    UV-->>Dev: venv updated, uv.lock fresh

    Dev->>Git: git commit (pre-commit stage)
    Git-->>prek: pre-commit
    prek->>UV: uv lock (lock file check)
    UV-->>Dev: uv.lock updated if pyproject.toml changed

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