refactor!: rebrand CCAM to AgentHub

Clean break, no compatibility alias. Renames the product name, the CLI
binary (`ccam` -> `agenthub`), the env var prefix (`CCAM_` ->
`AGENTHUB_`), the Prometheus metric namespace (`ccam_*` ->
`agenthub_*`), the tmux session prefix (`ccam-lane-<id>` ->
`agenthub-lane-<id>`), the per-repo runtime profile directory
(`.ccam/profile` -> `.agenthub/profile`), the lanes state root
(`~/.claude/ccam-lanes` -> `~/.claude/agenthub-lanes`), the bundled
plugins (`plugins/ccam*` -> `plugins/agenthub*`) and their slash
commands (`/ccam-doctor` -> `/agenthub-doctor`, `/ccam:*` ->
`/agenthub:*`).

Because there is no alias, an existing install has to be updated by
hand: rename its `.ccam/profile` directory and any `CCAM_*` variables,
and reinstall the plugin under its new name.

Two other name families are deliberately left alone here, since they are
not just strings: the `Claude-Code-Monitor` repository/marketplace name,
and the `agent-dashboard` npm package plus its `~/.claude/agent-dashboard`
runtime directory, which holds the live database and needs a migration
rather than a rename.

Verified: server 1406/1406, client 459/459, `grep -i ccam` clean across
tracked files, `openapi.yaml` regenerated (95 paths, unchanged count).

vscode-extension/README.md

@@ -1,6 +1,6 @@
-# Claude Code Agent Monitor for VS Code
+# AgentHub for VS Code
 
-**Claude Code Agent Monitor** brings a high-fidelity, real-time dashboard for your Claude Code AI sessions directly into your VS Code workspace. Monitor token usage, track agent health, and view deep analytics without switching windows.
+**AgentHub** brings a high-fidelity, real-time dashboard for your Claude Code AI sessions directly into your VS Code workspace. Monitor token usage, track agent health, and view deep analytics without switching windows.
 
 ![Extension Screenshot](https://raw.githubusercontent.com/Smartgift-AI/Claude-Code-Monitor/refs/heads/master/vscode-extension/vscode.png)
 
@@ -36,14 +36,14 @@ Jump directly to specific views from the sidebar:
 ## 🛠️ Getting Started
 
 ### 1. Requirements
-Ensure you have the Claude Code Agent Monitor server running locally:
+Ensure you have the AgentHub server running locally:
 ```bash
 npm install
 npm run dev
 ```
 
 ### 2. Installation
-- Search for **"Claude Code Agent Monitor"** in the VS Code Marketplace.
+- Search for **"AgentHub"** in the VS Code Marketplace.
 - Click **Install**.
 
 ### 3. Usage