Subagents, slash commands, skill scaffolder, and discoverability pass (#28)

Growth-focused additions drawn from studying alirezarezvani/claude-skills —
broaden content types beyond skills, lower contribution friction, and improve
discoverability.

Breadth (content types):
- agents/ — 4 Claude Code subagents (pm-partner, sprint-master, cs-guardian,
  launch-captain) that delegate to the strongest skills and run their helper
  scripts to compute results.
- commands/ — 6 slash commands (/prd, /rice, /sprint-plan, /health-scorecard,
  /retro, /exec-summary).
- install.sh --agent claude now installs skills + agents + commands into ~/.claude/.

Contribution UX:
- scripts/new-skill.mjs (npm run new-skill) scaffolds a SKILL.md that already
  passes SkillCheck.
- package.json exposes npm run entry points (new-skill, skillcheck, build:exports,
  build:web, check).

Discoverability:
- Keyword-rich README H1 (Agent Skills for Claude, ChatGPT, Gemini, Cursor,
  Codex & Hermes), subagent/command count badges, a Subagents & Slash Commands
  section, and a Star History chart. Contributing now points at the scaffolder.

CHANGELOG updated. SkillCheck, exports, and web index all verified in sync.


Claude-Session: https://claude.ai/code/session_016JWn5jRD5tcEFKrubjQ6Px

Co-authored-by: Claude <noreply@anthropic.com>

scripts/install.sh

@@ -100,6 +100,24 @@ else
     place "${skill%/}" "$TARGET/$name"
     count=$((count + 1))
   done
+
+  # Claude Code also gets subagents and slash commands (siblings of skills/).
+  if [ "$AGENT" = "claude" ]; then
+    claude_root="$(dirname "$TARGET")"   # ~/.claude
+    for kind in agents commands; do
+      src="$REPO_DIR/$kind"
+      [ -d "$src" ] || continue
+      dest="$claude_root/$kind"
+      [ "$DRYRUN" = 1 ] || mkdir -p "$dest"
+      for f in "$src"/*.md; do
+        base="$(basename "$f")"
+        [ "$base" = "README.md" ] && continue
+        if [ "$DRYRUN" = 1 ]; then echo "  would install $kind/$base -> $dest/$base";
+        else cp "$f" "$dest/$base"; fi
+        count=$((count + 1))
+      done
+    done
+  fi
 fi
 
 echo