fix(shared): preserve generated branch namespaces

[maria-rcks]

when a provider suggests fix/calendar-recruitment-filter, creating a new branch currently produces feature/fix/calendar-recruitment-filter. preserve every sanitized slash-separated namespace, including custom namespaces, while keeping the feature/ fallback. when an existing git ref blocks a parent or leaf, suffix only that path component: an existing fix makes fix/name become fix-2/name.

publication preserves genuine local namespaces such as origin/main instead of treating them as remote references. local branch enumeration and status use canonical names so matching tags or remote refs cannot hide the branch or its fork pr. comparisons and lazy diff requests keep full refs so local namespaces cannot shadow the remote base. source titles stay short; comparison controls display the full ref.

verification: 223 scoped tests, server typecheck, lint and formatting passed on blacksmith. the existing manager/driver cases retain fork pr associations, report one commit before publication and one commit ahead of the default afterward, and preserve committed changes in totals, previews, file-scoped previews, and full-file expansion. exact starting-head production lost the fork pr and returned the committed edit as both sides of file expansion. earlier loose/packed-ref driver checks preserved remote main and existing tags/branches. an untouched diff-preview statistics failure also occurs on the starting head and remains out of scope. the recorded real codex commit flow produced feature/fix/calendar-recruitment-filter before the change and fix/calendar-recruitment-filter after it.

unverified: unprefixed fallback and collision controls in the live client; current-head commit counts, push/create-pr controls, changes, file expansion, and full-ref display through the real provider/client path; complete recording playback and rendered pr media. native clients were not exercised. current-head ci and two final independent reviews remain pending.

closes #7073
closes #7074

model: gpt-6.1-sol (original implementation); unknown-model (latest correction/publication). harness: codex in t3 code.

[macroscopeapp]

Approvability

Verdict: Approved at 78565d3

Macroscope's review found this PR approvable — This is a focused Git namespace bug fix: generated branch names, publication, status, and diff comparisons become unambiguous while retaining the existing fallback behavior. Production changes are localized and backed by substantial unit and integration coverage, with no schema, deployment, security, or static-analysis impact.

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Reviewing files that changed from the base of the PR and between f3e4fbf and 78565d3.

📒 Files selected for processing (3)

• apps/server/src/git/GitManager.test.ts
• apps/server/src/vcs/GitVcsDriverCore.test.ts
• apps/server/src/vcs/GitVcsDriverCore.ts

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📝 Walkthrough

Walkthrough

Branch-name sanitization preserves slash-separated namespaces, and collision resolution adjusts conflicting path components. Git status and comparison-base handling use explicit branch and ref names. Publication handling supports selected local branch names. Tests cover name resolution, status, publication, and generated branch expectations.

Changes

Branch naming and Git ref handling

Layer / File(s)	Summary
Sanitize names and resolve collisions packages/shared/src/git.ts, packages/shared/src/git.test.ts, apps/server/src/textGeneration/CodexTextGeneration.test.ts	sanitizeFeatureBranchName preserves sanitized names containing /. resolveAutoFeatureBranchName resolves case-insensitive ref collisions by suffixing conflicting components. Tests cover namespace handling, fallback names, length limits, and collisions. The Codex test expects fix/important-system-change.
Resolve status and comparison refs apps/server/src/vcs/GitVcsDriverCore.ts, apps/server/src/vcs/GitVcsDriverCore.test.ts	Current-branch detection uses git branch --show-current. Comparison bases use fully qualified refs, while preview titles remove the ref prefix. Tests cover remote status, divergence, detached HEAD, and base-ref values.
Publish selected local branch names apps/server/src/vcs/GitVcsDriverCore.ts, apps/server/src/vcs/GitVcsDriverCore.test.ts, apps/server/src/git/GitManager.test.ts	Publish-branch resolution preserves an existing local branch name, and local branch listing avoids short-format namespace ambiguity. Tests cover publication targets, upstream configuration, and branch and tag ref collisions.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 78565

The branch-naming and publication changes are mergeable after normal checks; no concrete blocking issue remains.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 78565

The inspected changes preserve branch identities and make publication targets less ambiguous. No introduced security vulnerability was established. Concurrent actions and recovery after interrupted publication remain incompletely verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated mutation scope is the selected repository's local branches and the selected remote's branch refs, using existing Git authority. Preserving a namespace does not itself select a different remote or grant additional credentials.

Trust Boundaries and Controls

• observed — Generated feature-branch names still pass through a bounded sanitizer that restricts characters and removes leading separators. Publication uses explicit branch refspecs without force flags in the inspected paths, separating branch identity from remote authority.
• observed — Regression assertions verify that publishing local remote-like namespaces leaves remote main unchanged and retains the selected branch's upstream and PR identity. Collision assertions verify that existing branches and tags retain their original commit IDs.

Resilience and Maintainability Implications

• observed — The inspected push flow returns skipped_up_to_date when an existing upstream has no local delta. This handles that completed-state repetition, but does not establish idempotent recovery for an interrupted branch, commit and publication sequence.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Open issue #7073 is the only active direct target. sanitizeFeatureBranchName sanitizes and preserves slash-separated names such as fix/... and custom namespaces, while retaining the feature/ fal…
Out of Scope Changes check	✅ Passed	The Git publication, branch enumeration, status, and full-ref comparison changes support #7073. They preserve local names with namespace segments such as origin/main and prevent tags or remote refs …
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 6 files.
Title check	✅ Passed	The title clearly identifies the main change: preserving generated branch namespaces.
Description check	✅ Passed	The description explains the problem and change, links related issues, and gives specific verification results and limitations. It does not use the template headings or explicitly state maintainer app…

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Actionable comments posted: 1

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Inline comments:
Review comments at @packages/shared/src/git.ts:
- Line 69: Update resolveAutoFeatureBranchName to check for existing branch
names that occupy a parent path of the candidate, such as fix when the candidate
is fix/new-change. When a parent-ref conflict exists, choose a candidate outside
that occupied namespace; do not rely on suffixing only the final path component.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 4ee6bfd and 2348d69.

📒 Files selected for processing (3)

• apps/server/src/textGeneration/CodexTextGeneration.test.ts
• packages/shared/src/git.test.ts
• packages/shared/src/git.ts

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 5 remain after this review.

Dismissing prior approval to re-evaluate f3e4fbf

Dismissing prior approval to re-evaluate 78565d3