feat(project-bootstrap): recommend superpowers plugin if missing

CLAUDE.md template adds `use superpowers` as a trigger, but that line
is silently dead until the official plugin is installed. New Step 5.6
reads ~/.claude/plugins/installed_plugins.json and, when the
`superpowers@claude-plugins-official` key is absent, prints a chat-only
recommendation with the install command and the upstream link
(github.com/anthropics/claude-plugins-official).

Strict no-auto-install: slash commands aren't callable from a skill,
and silent plugin install would be overreach.

Bumps project-bootstrap 1.0.0 → 1.1.0. Rebuilt dist archive.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

skills/project-bootstrap/README.md

@@ -58,10 +58,14 @@ projects bootstrapped at different times debuggable.
    `.tasks/`, `CLAUDE.md`. Steps 3 and 4 delegate to the setup-skills.
 4. **Step 5.5.** Write `bootstrap-manifest.md` recording the versions of
    `project-bootstrap`, `setup-wiki`, and `setup-tasks` used.
-5. **Commit.** `chore: bootstrap project structure` for fresh repos, or
+5. **Step 5.6.** Detect the official `superpowers@claude-plugins-official`
+   plugin via `~/.claude/plugins/installed_plugins.json`. If absent, print
+   a one-time chat recommendation with the install command and upstream
+   link. Never auto-installs, never modifies project files.
+6. **Commit.** `chore: bootstrap project structure` for fresh repos, or
    `chore: upgrade project structure` adding only the new files for existing
    ones. Pushes only on explicit user request.
-6. **Summary.** Final report — what was created, what was skipped, suggested
+7. **Summary.** Final report — what was created, what was skipped, suggested
    next step.
 
 ## Rules