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).

mcp/build/.srchash

@@ -1 +1 @@
-7ce32b0af94537022c4a7ccc9132f11e9fdd376a76cbbfe2eed77dc78585b67d
+58f66551dc0f1fe59806a175930d9291f12393bebbe9656de01463fbdbcc1b35

mcp/package-lock.json

@@ -46,7 +46,7 @@
         "ws": "^8.18.0"
       },
       "bin": {
-        "ccam": "bin/ccam.js"
+        "agenthub": "bin/agenthub.js"
       },
       "devDependencies": {
         "concurrently": "^9.1.2",

mcp/package.json

@@ -1,7 +1,7 @@
 {
   "name": "agent-dashboard-mcp-server",
   "version": "1.0.0",
-  "description": "Local MCP server for the Claude Code Agent Monitor",
+  "description": "Local MCP server for AgentHub",
   "private": true,
   "type": "module",
   "bin": {