Add /publish skill for consistent multi-target deployment

Pushes to backup (full), fa-dev + sheffield (stripped via worktree),
and Chromatic in one command. Replaces ad-hoc push workflow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/publish/SKILL.md

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+Publish the project to all three targets: backup, dev remotes, and Chromatic.
+
+## Workflow
+
+### Step 1 — Pre-flight check
+
+1. Ensure there are no uncommitted changes: `git status --porcelain`
+   - If dirty, ask the user if they want to commit first
+2. Run `npx tsc --noEmit` to verify the build is clean
+   - If it fails, stop and report errors
+
+### Step 2 — Push to backup (everything)
+
+Push main directly to the `backup` remote (git.richie-snitch.online/richie/ParsonsFA). This is a private repo that receives the full repo including AI tooling, memory, and working docs.
+
+```bash
+git push backup main
+```
+
+If rejected (non-fast-forward), warn the user and ask before force-pushing.
+
+### Step 3 — Push to dev remotes (stripped)
+
+Both `fa-dev` and `sheffield` receive a stripped version with AI tooling removed. Use a temporary worktree to avoid touching the working directory.
+
+```bash
+# Clean up any prior worktree
+git worktree remove --force /tmp/dev-push 2>/dev/null
+git branch -D dev-clean 2>/dev/null
+
+# Create worktree from current main
+git worktree add /tmp/dev-push -b dev-clean
+
+# In the worktree, remove AI tooling from the index
+cd /tmp/dev-push
+for path in .claude/ docs/memory/ docs/reference/; do
+  git rm -r --cached "$path" 2>/dev/null
+done
+git commit -m "Strip AI tooling and working docs for dev push"
+
+# Push stripped branch to both dev remotes
+cd <project-root>
+git push fa-dev dev-clean:main --force
+git push sheffield dev-clean:main --force
+
+# Clean up
+git worktree remove --force /tmp/dev-push
+git branch -D dev-clean
+```
+
+**Important:** The `--force` is safe here because the stripped branch is always regenerated from main. Dev remotes never have unique commits.
+
+### Step 4 — Deploy to Chromatic
+
+```bash
+npm run chromatic
+```
+
+Run this in the background. Report the Storybook URL and build link when complete.
+
+### Step 5 — Report
+
+Summarise what was pushed:
+
+```
+Published to all targets:
+- backup  → git.richie-snitch.online/richie/ParsonsFA (full)
+- fa-dev  → git.richie-snitch.online/richie/Parsons (stripped)
+- sheffield → sheffield.sapiente.casa/richie/ParsonsFA (stripped)
+- Chromatic → [build link]
+```
+
+If any target failed, report which ones succeeded and which failed.