Unify temporary worktree branch naming

[juliusmarminge]

• Normalize generated names to the canonical 8-hex format
• Accept legacy UUID-shaped mobile branch names
• Add regression coverage for both behaviors

What Changed

Why

UI Changes

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Small shared git helper changes with backward-compatible matching; no auth, data, or orchestration logic beyond branch-name detection.

Overview
Temporary worktree refs now use a single canonical shape (t3code/<8 hex>) while still recognizing branch names older mobile clients created as t3code/<full RFC 4122 v4 UUID>.

buildTemporaryWorktreeBranchName strips non-hex from the random callback and keeps the first 8 hex digits, so a UUID-shaped generator still emits the short canonical name. isTemporaryWorktreeBranch matches both the 8-hex form and legacy v4 UUIDs (version 4, variant [89ab]), but rejects other UUID-looking strings so the matcher is not broadly loosened.

Regression tests cover canonicalization, legacy acceptance, and invalid UUID-shaped refs.

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Note

Unify temporary worktree branch naming to canonical t3code/<8-hex> form

• Updates TEMP_WORKTREE_BRANCH_PATTERN in git.ts to accept both the canonical t3code/<8-hex> format and legacy RFC 4122 v4 UUID-shaped refs (e.g. t3code/<8-4-4-4-12> with correct version/variant nibbles).
• Updates buildTemporaryWorktreeBranchName to normalize its output by lowercasing, stripping non-hex characters, and truncating to 8 hex characters, so UUID-shaped random values are reduced to the canonical form.
• Behavioral Change: branches built from UUID-shaped random callbacks now produce a shorter t3code/<8-hex> ref rather than a full UUID-shaped ref.

^{Macroscope summarized 3a822dc.}

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[cursor]

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[macroscopeapp]

Approvability

Verdict: Approved

This change adds backward compatibility for legacy UUID-shaped temporary worktree branch names while normalizing new branches to a canonical 8-hex format. The scope is limited to internal branch naming logic with appropriate test coverage.

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