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>

.tasks/STATUS.md

@@ -14,6 +14,14 @@ _Updated: 2026-04-28_
     🔵 Blocked    — waiting on external input
 -->
 
+## 🟢 [bootstrap-recommend-superpowers] — project-bootstrap recommends superpowers plugin if missing
+**Status:** done
+**Where I stopped:** Step 5.6 added to `skills/project-bootstrap/SKILL.md` (read `~/.claude/plugins/installed_plugins.json`, print install command + upstream link if `superpowers@claude-plugins-official` key missing); version bumped 1.0.0 → 1.1.0; README workflow numbering updated; skill reinstalled to `~/.claude/skills/project-bootstrap/` and `dist/project-bootstrap.skill` rebuilt; log entry added
+**Next action:** (none — kept until merged)
+**Branch:** master
+
+---
+
 ## 🟢 [mac-support-scripts] — fix install.sh / build.sh for stock macOS
 **Status:** done
 **Where I stopped:** patched both scripts to drop `mapfile` (bash 4+) and `find -printf` (GNU find) — replaced with portable shell glob + `basename` + `sort`; verified on git-bash (16 skills discovered, install dry-run + build smoke-test passed); wiki concept page `install-portability.md` added; index + log updated