docs: clarify agent-reach has no read/search commands (#59)

- Remove dead '# ── read ──' placeholder comment in cli.py
- Reword SKILL.md to make it explicit that agent-reach is an
  installer/config tool, not a content fetcher
- Addresses confusion from issue #58

Co-authored-by: Panniantong <panniantong@users.noreply.github.com>

agent_reach/cli.py

@@ -57,7 +57,6 @@ def main():
     parser.add_argument("--version", action="version", version=f"Agent Reach v{__version__}")
     sub = parser.add_subparsers(dest="command", help="Available commands")
 
-    # ── read ──
     # ── setup ──
     sub.add_parser("setup", help="Interactive configuration wizard")