Update issue-to-pr skill (#732)

* Update issue-to-pr skill.

Clarify the command pointer to the specific issue-to-pr reference doc and require branch preflight from main before implementation to avoid stacking PR work on unrelated feature branches.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Rename issue2pr command to issue-to-pr.

Replace the Cursor command file name and text reference so all issue-to-PR command instances consistently use issue-to-pr naming.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Update .cursor/commands/issue-to-pr.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Use consistent <issue_number> placeholder in issue-to-pr workflow

Replace <number> with <issue_number> in branch name examples to match
the placeholder used in the rest of the workflow (Copilot suggestion).

Made-with: Cursor

---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 3 people

.cursor/commands/issue-to-pr.md

@@ -0,0 +1,4 @@
+# Issue to Pull Request
+
+This command points to the `pr-workflows` Skill in
+`.github/skills/pr-workflows/`. Specifically, see `.github/skills/pr-workflows/reference/issue-to-pr.md`.

.cursor/commands/issue2pr.md

@@ -5,6 +5,12 @@ description: Transform a GitHub issue into a complete pull request through a str
 
 # Issue → PR Workflow
 
+## Branch preflight (required before any code edits)
+1. Check current branch and working tree state.
+2. Switch to `main` and update it from remote.
+3. Create the issue branch from `main`: `git checkout -b issue-<issue_number>-<short-description>`
+4. Only start implementation after confirming the new branch is based on `main`.
+
 ## Discovery
 1. Fetch issue details:
    ```bash
@@ -14,9 +20,8 @@ description: Transform a GitHub issue into a complete pull request through a str
 3. Estimate complexity and share approach before implementation.
 
 ## Implementation
-1. Create a branch: `git checkout -b issue-<number>-<short-description>`
-2. Implement the fix, following `AGENTS.md` policies.
-3. Run pre-commit and tests until green (see `pre-commit.md`).
+1. Implement the fix, following `AGENTS.md` policies.
+2. Run pre-commit and tests until green (see `pre-commit.md`).
 
 ## Prepare PR
 1. Create `.github/pr_summaries/<issue_number> - <short-description>.md` with:
@@ -30,6 +35,6 @@ description: Transform a GitHub issue into a complete pull request through a str
 
 ## Create PR
 ```bash
-git push -u origin issue-<number>-<short-description>
+git push -u origin issue-<issue_number>-<short-description>
 gh pr create --title "<PR title>" --body-file .github/pr_summaries/<issue_number> - <short-description>.md --base main
 ```