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>

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "pm-claude-skills",
+  "version": "16.0.0",
+  "private": true,
+  "type": "module",
+  "description": "167 professional agent skills for Claude, ChatGPT, Gemini, Cursor, Codex & Hermes — plus subagents, slash commands, and a multi-platform export pipeline.",
+  "license": "MIT",
+  "homepage": "https://github.com/mohitagw15856/pm-claude-skills",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mohitagw15856/pm-claude-skills.git"
+  },
+  "scripts": {
+    "new-skill": "node scripts/new-skill.mjs",
+    "skillcheck": "node scripts/skillcheck.mjs",
+    "build:exports": "node scripts/build-exports.mjs",
+    "build:web": "node web/build-skills.mjs",
+    "check": "node scripts/skillcheck.mjs && node scripts/build-exports.mjs --check"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}