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).

docs/superpowers/plans/2026-08-14-split-terminal-view.md

@@ -13,7 +13,7 @@
 - No server/API changes — this is a client-only feature (per the approved spec, docs/superpowers/specs/2026-08-14-split-terminal-view-design.md).
 - No synchronized input across panes — each `TerminalView` keeps its own independent WebSocket connection.
 - Layout 1 must remain behaviorally and structurally identical to today's Workspace (existing `Workspace.test.tsx` assertions about `console-body`, `lane-detail` nesting, and the no-`/stage`-call invariant must still pass unmodified where they test layout-1 behavior).
-- Layout + pane lane selections persist to `localStorage` under key `ccam.workspace.splitView`; a persisted lane id that no longer exists in the loaded lane list falls back to unselected for that pane.
+- Layout + pane lane selections persist to `localStorage` under key `agenthub.workspace.splitView`; a persisted lane id that no longer exists in the loaded lane list falls back to unselected for that pane.
 - Every new/modified `.ts`/`.tsx` file must carry the project's file header (see `.claude/skills/file-headers/`).
 - Run `npm run test:client` before finishing; this is a client-only change so `npm run test:server` is not required, but do not skip `test:client`.
 
@@ -61,12 +61,12 @@ describe("splitViewStorage", () => {
   });
 
   it("falls back to the default when stored JSON is malformed", () => {
-    localStorage.setItem("ccam.workspace.splitView", "{not json");
+    localStorage.setItem("agenthub.workspace.splitView", "{not json");
     expect(readSplitViewState()).toEqual(defaultSplitViewState());
   });
 
   it("falls back to the default when the stored layout is not 1, 2, or 4", () => {
-    localStorage.setItem("ccam.workspace.splitView", JSON.stringify({ layout: 3, paneLaneIds: [] }));
+    localStorage.setItem("agenthub.workspace.splitView", JSON.stringify({ layout: 3, paneLaneIds: [] }));
     expect(readSplitViewState()).toEqual(defaultSplitViewState());
   });
 });
@@ -96,7 +96,7 @@ export interface SplitViewState {
   paneLaneIds: (number | null)[];
 }
 
-const STORAGE_KEY = "ccam.workspace.splitView";
+const STORAGE_KEY = "agenthub.workspace.splitView";
 
 export function defaultSplitViewState(): SplitViewState {
   return { layout: 1, paneLaneIds: [null] };
@@ -888,7 +888,7 @@ describe("split terminal view", () => {
 
   it("falls back to unselected when a persisted lane id no longer exists", async () => {
     localStorage.setItem(
-      "ccam.workspace.splitView",
+      "agenthub.workspace.splitView",
       JSON.stringify({ layout: 2, paneLaneIds: [9999, null] })
     );
     await renderWorkspace();
@@ -1048,7 +1048,7 @@ git commit -m "feat(workspace): add 1/2/4-pane split terminal view toggle"
 In `docs/LANES.md`, in the "## The Workspace page (`/run`)" section, after the existing "**Terminal**" bullet (line 312), add:
 
 ```markdown
-- **Split view** — a layout toggle (1 / 2 / 4 panes) renders that many independent terminal panes side by side (`grid-cols-2` for 2, a 2x2 grid for 4). Layout 1 is bound to the lane strip's selection, same as always; layouts 2 and 4 give each pane its own lane picker, independent of the strip. The chosen layout and each pane's lane persist to `localStorage` (`ccam.workspace.splitView`) across reloads.
+- **Split view** — a layout toggle (1 / 2 / 4 panes) renders that many independent terminal panes side by side (`grid-cols-2` for 2, a 2x2 grid for 4). Layout 1 is bound to the lane strip's selection, same as always; layouts 2 and 4 give each pane its own lane picker, independent of the strip. The chosen layout and each pane's lane persist to `localStorage` (`agenthub.workspace.splitView`) across reloads.
 ```
 
 - [ ] **Step 2: Verify doc accuracy against the implementation**