Add Claude Code plugin manifest and commands

Packages C3Poh as a Claude Code plugin with:
- .claude-plugin/plugin.json metadata
- /c3poh-start command to launch Telegram bridge
- /c3poh-status command for bridge status

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: andyuninvited

.claude-plugin/plugin.json

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+{
+  "name": "c3poh",
+  "description": "Telegram bridge for Claude Code. DM your agent from your phone and receive responses. Uses long-polling with no inbound ports, allowlist-based access control, and outbound-only traffic.",
+  "version": "1.0.0",
+  "author": {
+    "name": "Andy Rosic",
+    "url": "https://github.com/andyuninvited"
+  },
+  "homepage": "https://andyuninvited.github.io/tinman_for_claudecode/",
+  "repository": "https://github.com/andyuninvited/c3poh_for_claudecode",
+  "license": "GPL-3.0",
+  "keywords": ["telegram", "notifications", "mobile", "bridge", "remote-access"]
+}

commands/c3poh-start.md

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+# C3Poh Start
+
+Start the C3Poh Telegram bridge for this session.
+
+## Usage
+
+```
+/c3poh-start
+```
+
+## Instructions
+
+Start the C3Poh Telegram bot so the user can interact with Claude Code from their phone. C3Poh must be installed (`pip install c3poh-for-claudecode`).
+
+Run `c3poh start` to begin the Telegram bridge in the background. If C3Poh is not configured, offer to run `c3poh init` to set up the Telegram bot token and user allowlist.
+
+Confirm the bot is running and remind the user of their Telegram bot name.

commands/c3poh-status.md

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+# C3Poh Status
+
+Check if the C3Poh Telegram bridge is running.
+
+## Usage
+
+```
+/c3poh-status
+```
+
+## Instructions
+
+Run `c3poh status` to check whether the Telegram bridge is currently active, which user IDs are on the allowlist, and when the last message was received. Report the status to the user.