feat(skills): Add 'Use when / Don't use when' routing blocks (#14521)

* feat(skills): add 'Use when / Don't use when' blocks to skill descriptions

Based on OpenAI's Shell + Skills + Compaction best practices article.

Key changes:
- Added clear routing logic to skill descriptions
- Added negative examples to prevent misfires
- Added templates/examples to github skill
- Included Blake's specific setup notes for openhue

Skills updated:
- apple-reminders: Clarify vs Clawdbot cron
- github: Clarify vs local git operations
- imsg: Clarify vs other messaging channels
- openhue: Add device inventory, room layout
- tmux: Clarify vs exec tool
- weather: Add location defaults, format codes

Reference: https://developers.openai.com/blog/skills-shell-tips

* fix(skills): restore metadata and generic CLI examples

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

skills/github/SKILL.md

@@ -30,48 +30,134 @@ metadata:
 
 # GitHub Skill
 
-Use the `gh` CLI to interact with GitHub. Always specify `--repo owner/repo` when not in a git directory, or use URLs directly.
+Use the `gh` CLI to interact with GitHub repositories, issues, PRs, and CI.
 
-## Pull Requests
+## When to Use
 
-Check CI status on a PR:
+✅ **USE this skill when:**
+
+- Checking PR status, reviews, or merge readiness
+- Viewing CI/workflow run status and logs
+- Creating, closing, or commenting on issues
+- Creating or merging pull requests
+- Querying GitHub API for repository data
+- Listing repos, releases, or collaborators
+
+## When NOT to Use
+
+❌ **DON'T use this skill when:**
+
+- Local git operations (commit, push, pull, branch) → use `git` directly
+- Non-GitHub repos (GitLab, Bitbucket, self-hosted) → different CLIs
+- Cloning repositories → use `git clone`
+- Reviewing actual code changes → use `coding-agent` skill
+- Complex multi-file diffs → use `coding-agent` or read files directly
+
+## Setup
 
 ```bash
+# Authenticate (one-time)
+gh auth login
+
+# Verify
+gh auth status
+```
+
+## Common Commands
+
+### Pull Requests
+
+```bash
+# List PRs
+gh pr list --repo owner/repo
+
+# Check CI status
 gh pr checks 55 --repo owner/repo
+
+# View PR details
+gh pr view 55 --repo owner/repo
+
+# Create PR
+gh pr create --title "feat: add feature" --body "Description"
+
+# Merge PR
+gh pr merge 55 --squash --repo owner/repo
 ```
 
-List recent workflow runs:
+### Issues
 
 ```bash
+# List issues
+gh issue list --repo owner/repo --state open
+
+# Create issue
+gh issue create --title "Bug: something broken" --body "Details..."
+
+# Close issue
+gh issue close 42 --repo owner/repo
+```
+
+### CI/Workflow Runs
+
+```bash
+# List recent runs
 gh run list --repo owner/repo --limit 10
-```
 
-View a run and see which steps failed:
-
-```bash
+# View specific run
 gh run view <run-id> --repo owner/repo
-```
 
-View logs for failed steps only:
-
-```bash
+# View failed step logs only
 gh run view <run-id> --repo owner/repo --log-failed
+
+# Re-run failed jobs
+gh run rerun <run-id> --failed --repo owner/repo
 ```
 
-## API for Advanced Queries
-
-The `gh api` command is useful for accessing data not available through other subcommands.
-
-Get PR with specific fields:
+### API Queries
 
 ```bash
+# Get PR with specific fields
 gh api repos/owner/repo/pulls/55 --jq '.title, .state, .user.login'
+
+# List all labels
+gh api repos/owner/repo/labels --jq '.[].name'
+
+# Get repo stats
+gh api repos/owner/repo --jq '{stars: .stargazers_count, forks: .forks_count}'
 ```
 
 ## JSON Output
 
-Most commands support `--json` for structured output. You can use `--jq` to filter:
+Most commands support `--json` for structured output with `--jq` filtering:
 
 ```bash
 gh issue list --repo owner/repo --json number,title --jq '.[] | "\(.number): \(.title)"'
+gh pr list --json number,title,state,mergeable --jq '.[] | select(.mergeable == "MERGEABLE")'
 ```
+
+## Templates
+
+### PR Review Summary
+
+```bash
+# Get PR overview for review
+PR=55 REPO=owner/repo
+echo "## PR #$PR Summary"
+gh pr view $PR --repo $REPO --json title,body,author,additions,deletions,changedFiles \
+  --jq '"**\(.title)** by @\(.author.login)\n\n\(.body)\n\n📊 +\(.additions) -\(.deletions) across \(.changedFiles) files"'
+gh pr checks $PR --repo $REPO
+```
+
+### Issue Triage
+
+```bash
+# Quick issue triage view
+gh issue list --repo owner/repo --state open --json number,title,labels,createdAt \
+  --jq '.[] | "[\(.number)] \(.title) - \([.labels[].name] | join(", ")) (\(.createdAt[:10]))"'
+```
+
+## Notes
+
+- Always specify `--repo owner/repo` when not in a git directory
+- Use URLs directly: `gh pr view https://github.com/owner/repo/pull/55`
+- Rate limits apply; use `gh api --cache 1h` for repeated queries