NO-SNOW: Add repo-local graphite-pr-workflow skill with mvn format + checkstyle pre-commit rules

.cursor/skills/graphite-pr-workflow/SKILL.md

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+---
+name: graphite-pr-workflow
+description: Create branches, commits, and pull requests using Graphite CLI (gt) for the snowflake-jdbc repository. Use when the user asks to create a PR, submit a PR, commit changes, or push a branch. Covers Graphite commands, SNOW-ticket commit message conventions, PR description templates, and snowflake-jdbc-specific pre-commit formatting/checkstyle requirements.
+---
+
+# Graphite PR Workflow (snowflake-jdbc)
+
+## CRITICAL: Do Not Commit or Submit Without Explicit Instruction
+
+**NEVER run `gt commit create`, `git commit`, `gt submit`, or open a PR unless the user has explicitly asked you to.** Completing a feature is NOT permission to commit. Passing tests is NOT permission to commit. Pre-commit checks succeeding is NOT permission to commit.
+
+When you have finished implementing a feature or change, you MAY ask the user whether they want you to proceed with creating a commit and PR. Phrase it as a question and wait for explicit confirmation before doing anything that mutates git history or the remote.
+
+Examples of acceptable prompts after finishing work:
+- "The change is implemented and tests pass. Would you like me to format, run checkstyle, and create a commit + PR?"
+- "Should I proceed with `gt commit create` and `gt submit`?"
+
+Do NOT interpret ambiguous responses ("looks good", "great", "thanks") as approval to commit. Wait for an explicit "yes, commit" / "create the PR" / "go ahead and submit".
+
+## Required Pre-Commit Checks (snowflake-jdbc)
+
+Before running ANY commit command (`gt commit create`, `git commit`, `gt commit amend`), you MUST run the following two Maven commands in order from the repo root and confirm they succeed:
+
+1. **Format the code** with the Spotify fmt plugin:
+
+   ```bash
+   mvn com.spotify.fmt:fmt-maven-plugin:format
+   ```
+
+2. **Validate checkstyle** passes cleanly:
+
+   ```bash
+   mvn clean validate --batch-mode --show-version -P check-style
+   ```
+
+If either command fails, fix the reported issues (re-running the formatter for any new files, or addressing checkstyle violations manually) and re-run both commands until both succeed. Only then may you proceed with committing — and only if the user has explicitly asked you to commit (see section above).
+
+## Commit Message Convention
+
+Prefix with Jira ticket: `SNOW-{ticket}: {description}`
+
+```
+SNOW-3254915: Add QueryStatus enum and is_still_running/is_an_error static methods
+```
+
+Use `NO-SNOW:` for changes without a ticket.
+
+## Creating a PR (only after explicit user approval)
+
+```bash
+# 1. Create a tracked branch
+gt branch create {user}/{branch-name}
+
+# 2. Format and validate (REQUIRED before staging/committing — see Pre-Commit Checks above)
+mvn com.spotify.fmt:fmt-maven-plugin:format
+mvn clean validate --batch-mode --show-version -P check-style
+
+# 3. Stage files
+git add <files>
+
+# 4. Commit (runs pre-commit hooks)
+gt commit create -m "SNOW-{ticket}: {description}"
+
+# 5. Push and create PR (draft mode in non-interactive)
+gt submit --no-edit
+```
+
+Then update title/description via `gh pr edit` or the Graphite web UI.
+
+## PR Description Template
+
+```markdown
+## Summary
+- Bullet points describing what changed and why
+
+## Context
+Brief explanation of how this fits into the larger effort (e.g., "first of two PRs for...")
+
+## Test plan
+Explain how the change was tested: what commands were run, what was
+verified, and the results. Be specific to this PR.
+```
+
+## Key Commands
+
+| Command | Purpose |
+|---------|---------|
+| `mvn com.spotify.fmt:fmt-maven-plugin:format` | Auto-format Java sources (REQUIRED before commit) |
+| `mvn clean validate --batch-mode --show-version -P check-style` | Run checkstyle validation (REQUIRED before commit) |
+| `gt branch create {user}/{branch-name}` | Create branch tracked by Graphite |
+| `gt commit create -m "..."` | Commit with message |
+| `gt commit amend` | Amend current commit |
+| `gt submit --no-edit` | Push and create/update PR |
+| `gt submit --stack` | Submit entire stack of PRs |
+| `gt restack` | Rebase stack after upstream changes |
+
+## Before Creating a PR: Required Checks
+
+Before proceeding with branch creation or committing, you MUST:
+
+1. **Confirm the user has explicitly requested a commit/PR.** See the top of this file. Do not commit proactively.
+
+2. **Run the formatter and checkstyle commands** described in the Required Pre-Commit Checks section above and confirm both pass.
+
+3. **Ask for SNOW ticket number** if the user hasn't provided one. Use AskQuestion:
+   - Prompt: "What is the SNOW Jira ticket number for this change?"
+   - Options: a text-free response, or "NO-SNOW (no ticket)"
+   Do NOT proceed with a commit until the ticket number is confirmed.
+
+4. **Detect stacked PR situation.** Run `git log --oneline main..HEAD` or check `git branch --show-current` and its parent. If the current branch is NOT based directly off `main` (i.e., there are intermediate branches), ask:
+   - "This branch is based off `{parent_branch}`, not `main`. Should this be a stacked PR?"
+   - If yes: use `gt submit --stack` to submit the full stack
+   - If no: use `gt submit --no-edit` for just this branch
+
+## Notes
+
+- `gt submit --no-edit` creates PRs in **draft mode** when non-interactive
+- Pre-commit hooks run automatically on `gt commit create`, but they are NOT a substitute for running the formatter + checkstyle commands manually beforehand