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).

plugins/agenthub-dashboard/skills/endpoint-probe/SKILL.md

@@ -0,0 +1,62 @@
+---
+description: >
+  Probes each major Agent Monitor API route — /api/stats, /api/analytics,
+  /api/sessions, /api/pricing/cost, /api/workflows/runs, /api/cc-config/overview
+  — and reports each one's HTTP status, latency, and response shape, flagging
+  which are reachable. Use to verify a dashboard install is wired up correctly.
+---
+
+# Endpoint Probe
+
+Smoke-test the dashboard's main API surface by hitting each major route once and
+reporting whether it responds and what shape it returns.
+
+## Input
+
+The user provides: **$ARGUMENTS**
+
+Options: empty (default: probe all routes below), or a substring to filter which
+routes are probed (e.g. `pricing` probes only matching routes).
+
+## Data Sources
+
+| Endpoint | Returns |
+|----------|---------|
+| `GET /api/stats` | `{ total_sessions, active_sessions, active_agents, total_agents, total_events, events_today, ws_connections, agents_by_status, sessions_by_status }` |
+| `GET /api/analytics` | `{ overview, tokens, tool_usage, daily_events, daily_sessions, agent_types, event_types, avg_events_per_session, total_subagents, sessions_by_status, agents_by_status }` |
+| `GET /api/sessions` | Session list; each: `id, status, model, cwd, started_at, ended_at, cost, metadata` |
+| `GET /api/pricing/cost` | `{ total_cost, breakdown:[{ model, input_tokens, output_tokens, cache_read_tokens, cache_write_tokens, cost, matched_rule }] }` |
+| `GET /api/workflows/runs` | Workflow-tool run journals (fleets) |
+| `GET /api/cc-config/overview` | Claude Code config explorer overview (skills, agents, commands, plugins, mcp, hooks, etc.) |
+
+## Method
+
+For each route, issue a single `GET` against `http://localhost:4820<path>` with a
+short timeout, capturing the HTTP status code, round-trip latency, and the
+top-level shape of the JSON body (object keys, or array length). A route counts
+as reachable when it returns a 2xx with parseable JSON.
+
+If `/api/stats` itself fails to connect, the dashboard is not running — stop and
+tell the user to start it with `npm start` (or `npm run dev`) from the repo root.
+
+## Report Sections
+
+### 1. Probe Matrix
+A Markdown table — one row per route — with columns:
+`endpoint`, `status` (HTTP code), `latency`, `reachable` (✅/❌), `shape`
+(e.g. `object: {total_cost, breakdown[…]}` or `array[N]`).
+
+### 2. Reachability Summary
+Count of reachable vs total. Name any unreachable or non-2xx routes explicitly.
+
+### 3. Verdict
+One line: install looks healthy (all reachable) or partially wired (list the
+gaps and the most likely cause — server not running, route disabled, or empty data).
+
+## Output
+
+- Compact Markdown; the probe matrix is the centerpiece.
+- Cite the real status code, latency, and observed shape per route — never assume.
+- Report shape from what actually came back; if a route returns an empty array or
+  object, say so rather than inferring fields.
+- Keep currency, where shown, to 4 decimals (e.g. `total_cost: $0.0000`).