Add GitHub issue pipelines and prompts using gh CLI

gh-issue-impl, gh-issue-research, gh-issue-rewrite, gh-issue-update
pipelines with corresponding prompts for fetch-assess, plan,
implement, and create-pr steps.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.wave/prompts/speckit-flow/create-pr.md

@@ -0,0 +1,53 @@
+You are creating a pull request for the implemented feature and requesting a review.
+
+Feature context: {{ input }}
+
+## Working Directory
+
+You are running in an **isolated git worktree** shared with previous pipeline steps.
+Your working directory IS the project root. The feature branch was created by a
+previous step and is already checked out.
+
+## Instructions
+
+1. Find the branch name and feature directory from the spec info artifact
+
+2. **Verify implementation**: Run `go test -race ./...` one final time to confirm
+   all tests pass. If tests fail, fix them before proceeding.
+
+3. **Stage changes**: Review all modified and new files with `git status` and `git diff`.
+   Stage relevant files — exclude any sensitive files (.env, credentials).
+
+4. **Commit**: Create a well-structured commit (or multiple commits if logical):
+   - Use conventional commit prefixes: `feat:`, `fix:`, `refactor:`, `test:`, `docs:`
+   - Write concise commit messages focused on the "why"
+   - Do NOT include Co-Authored-By or AI attribution lines
+
+5. **Push**: Push the branch to the remote repository:
+   ```bash
+   git push -u origin HEAD
+   ```
+
+6. **Create Pull Request**: Use `gh pr create` with a descriptive summary:
+   ```bash
+   gh pr create --title "<concise title>" --body "<PR body with summary and test plan>"
+   ```
+
+   The PR body should include:
+   - Summary of changes (3-5 bullet points)
+   - Link to the spec file in the specs/ directory
+   - Test plan describing how changes were validated
+   - Any known limitations or follow-up work needed
+
+7. **Request Copilot Review**: After the PR is created, request a review from Copilot:
+   ```bash
+   gh pr edit --add-reviewer "copilot"
+   ```
+
+## CONSTRAINTS
+
+- Do NOT spawn Task subagents — work directly in the main context
+
+## Output
+
+Produce a JSON status report matching the injected output schema.