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/__tests__/lanes-lib.test.js

@@ -78,7 +78,7 @@ describe("pipelines", () => {
   });
 
   it("keeps the evidence of a stage declared under an alias", () => {
-    // `lane.stages` is keyed by the raw declared string, so `ccam stage
+    // `lane.stages` is keyed by the raw declared string, so `agenthub stage
     // planning --evidence x` files the record under "planning" while the node
     // is "plan". Looking it up by node id alone loses the evidence and paints
     // a `done` node amber — silently, and only for agents that use an alias.
@@ -151,12 +151,12 @@ describe("per-node driver command", () => {
 
     assert.equal(byId.intake, "/superpowers:brainstorming");
     assert.equal(byId.implementing, "/superpowers:test-driven-development");
-    assert.equal(byId.gates, "ccam lanes hook ci-gate");
+    assert.equal(byId.gates, "agenthub lanes hook ci-gate");
     // A terminal or gate node has no work of its own to run: reaching it IS
     // the declaration, so its command is the declaration - which keeps
-    // `ccam lanes node <id>` runnable for every node in the template.
-    assert.equal(byId.done, "ccam stage done");
-    assert.equal(byId["e2e-feature-passed"], "ccam stage e2e-feature-passed");
+    // `agenthub lanes node <id>` runnable for every node in the template.
+    assert.equal(byId.done, "agenthub stage done");
+    assert.equal(byId["e2e-feature-passed"], "agenthub stage e2e-feature-passed");
   });
 
   it("defaults a template node that declares no command to the empty string", () => {
@@ -334,7 +334,7 @@ describe("lanes lib", () => {
     assert.equal(p.liveness, "idle");
     // The template's driving slash command rides along so the run console can
     // pre-fill its prompt with it.
-    assert.equal(p.pipeline_skill, "/ccam:ship-feature");
+    assert.equal(p.pipeline_skill, "/agenthub:ship-feature");
     lanes.deleteLane(l.id);
   });
 
@@ -1080,7 +1080,7 @@ describe("stage detection", () => {
     db.prepare("UPDATE lanes SET detected_at = ? WHERE id = ?").run(oldTime, l.id);
 
     // With nothing declared, the last detection IS the lane's last known
-    // progress — blanking it left every non-CCAM repo's card 100% pending
+    // progress — blanking it left every non-AgentHub repo's card 100% pending
     // forever. Still amber (`detected`), still never `done`.
     const payload = lanes.lanePayload(lanes.getLane(l.id));
     const tests = payload.pipeline_nodes.find((n) => n.id === "tests");