npx CLI installer (cross-platform) + v17.0.0 (#29)

Cross-platform one-command install (fixes the Windows gap; alirezarezvani's
repo has no npm CLI, so this is a genuine differentiator):

- bin/cli.mjs — pure-Node installer, no bash/git, works on Windows/macOS/Linux:
    npx pm-claude-skills add --agent <claude|hermes|codex|openclaw|cursor>
  with --link / --target / --dry-run. For claude it installs skills + subagents
  + commands. Includes list / --version / --help.
- package.json is now a publishable package: name pm-claude-skills (the name
  "pm-skills" is already taken on npm), bin + files + keywords, version 17.0.0.
  npm pack is ~1.8 MB / 711 files.

Version bump to v17.0.0 (Agents, Commands & the npx CLI) since v16.0.0 is
published: README badge/What's-New (v16 moved to collapsed history), CHANGELOG
promoted Unreleased -> [17.0.0] with the npx entry, SECURITY support table, and
the Quick Install + one-command sections now lead with npx and flag the
Windows/PowerShell path.


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

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

package.json

@@ -1,15 +1,45 @@
 {
   "name": "pm-claude-skills",
-  "version": "16.0.0",
-  "private": true,
+  "version": "17.0.0",
   "type": "module",
-  "description": "167 professional agent skills for Claude, ChatGPT, Gemini, Cursor, Codex & Hermes — plus subagents, slash commands, and a multi-platform export pipeline.",
+  "description": "167 professional Agent Skills (SKILL.md) + subagents + slash commands for Claude, ChatGPT, Gemini, Cursor, Codex & Hermes. Install into any AI coding tool with: npx pm-claude-skills add --agent <tool>.",
+  "keywords": [
+    "claude",
+    "claude-code",
+    "claude-skills",
+    "agent-skills",
+    "skill-md",
+    "chatgpt",
+    "gemini",
+    "cursor",
+    "codex",
+    "hermes-agent",
+    "ai-agents",
+    "subagents",
+    "slash-commands",
+    "prompt-engineering",
+    "product-management"
+  ],
   "license": "MIT",
   "homepage": "https://github.com/mohitagw15856/pm-claude-skills",
   "repository": {
     "type": "git",
     "url": "https://github.com/mohitagw15856/pm-claude-skills.git"
   },
+  "bugs": {
+    "url": "https://github.com/mohitagw15856/pm-claude-skills/issues"
+  },
+  "author": "Mohit Aggarwal",
+  "bin": {
+    "pm-claude-skills": "bin/cli.mjs"
+  },
+  "files": [
+    "bin/",
+    "skills/",
+    "agents/",
+    "commands/",
+    "exports/"
+  ],
   "scripts": {
     "new-skill": "node scripts/new-skill.mjs",
     "skillcheck": "node scripts/skillcheck.mjs",