merge: align dev branch with main

openspec/changes/git-repo-ssh-clone-check/tasks.md

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+## 1. Backend - SSH Existence Check
+
+- [ ] 1.1 Add `git ls-remote` preflight to repository creation in `git_repositories.py`
+- [ ] 1.2 Build SSH clone URL from `owner` and `repo` for `git.commumedia.org`
+- [ ] 1.3 Return a clear error when the repository is missing or inaccessible
+
+## 2. Frontend - Structured Clone Form
+
+- [ ] 2.1 Update `RepositoryCreateDialog` clone mode to accept `owner` and `repo`
+- [ ] 2.2 Keep advanced full-URL paste flow and blank repository fallback
+- [ ] 2.3 Reuse the shared dialog from repository settings and repositories page
+
+## 3. Validation and Docs
+
+- [ ] 3.1 Update repository docs to explain SSH-only owner/repo input
+- [ ] 3.2 Add tests for success, missing repo, and URL fallback behavior
+
+## 4. Quality Gates
+
+- [ ] 4.1 Run backend and frontend targeted tests
+- [ ] 4.2 Run frontend typecheck and lint where applicable
+- [ ] 4.3 Commit and push changes