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).

server/lib/lane-services.js

@@ -1,6 +1,6 @@
 /**
  * @file A lane's own database: create it once at provisioning and boot, drop
- * it on remove. CCAM stays stack-agnostic here — `createdb` vs `mysqladmin
+ * it on remove. AgentHub stays stack-agnostic here — `createdb` vs `mysqladmin
  * create` vs `touch foo.db` genuinely differ, so the actual command lives in
  * the profile's `db-create.sh`/`db-drop.sh` hooks (already in the A1
  * allowlist); this module only decides WHEN to call them and guards WHICH
@@ -16,11 +16,11 @@ const { dbName, slotDirs } = require("./lane-slots");
 const { runHook } = require("./lane-profile");
 
 /**
- * Where CCAM records that a slot's database has already been created.
+ * Where AgentHub records that a slot's database has already been created.
  *
  * A hook can't be trusted to know this on its own without being stack-aware
  * (a plain `createdb` errors on a database that already exists; `touch`
- * wouldn't), so CCAM tracks it itself with one flag file per database name,
+ * wouldn't), so AgentHub tracks it itself with one flag file per database name,
  * beside the rest of a slot's runtime bookkeeping. This is also how `upLane`
  * tells "freshly created" from "already existed" to decide whether to seed.
  */
@@ -63,10 +63,10 @@ async function ensureDatabase(lane, profile, options = {}) {
  * Drop a database via the profile's `db-drop` hook.
  *
  * Two checks run before anything is spawned, and neither trusts the caller:
- * `assertManaged` (an adopted lane's data is the user's own, never CCAM's to
+ * `assertManaged` (an adopted lane's data is the user's own, never AgentHub's to
  * destroy) and a name check against what THIS lane's slot actually derives —
  * the lane's own database or its `_test` sibling, and nothing else. Only a
- * name CCAM itself computed can ever reach the hook.
+ * name AgentHub itself computed can ever reach the hook.
  *
  * @param {object} lane - Lane row; `slot` must already be allocated.
  * @param {object} profile - Resolved profile.