agent permissions: one set, tool groups included, set at agent creation

mara on #5170: "dont split caps and perms. its all perms. / dont include
the now empty tool groups / nothing set -> default / also add perms to
agent creation screen".

- hive-sh4re: one `Permission` enum (messaging, meta, inbox, execution,
  web_tools, manage_root_agent) replaces `ToolGroup` and `Capability`;
  `lifecycle`/`forge` are gone. `Permission::default_for` is the default
  for an agent the swarm sets nothing for.
- The record is `{ "permissions": [...] }`. Missing key, unset field or
  no successful read yet = default; `[]` = none; a failed read after a
  good one keeps the last value.
- hive-agent reads its own key every 10s and builds each turn's --tools,
  --allowedTools and MCP config (rewritten before every turn) from it;
  the subagent daemon reads it on each start/continue. Agents get a
  read-only grant on their own key.
- hive-c0re restarts an agent only when its manage_root_agent changes.
  The import now merges meta/capabilities.json and meta/tool-groups.json
  into one list per agent and deletes both; the "import pending, don't
  read" decision is `ImportOutcome::read_allowed`, table-tested.
- swarm-controller: `GET /api/permissions` (names + default) and an
  optional `permissions` on `POST /api/agents`, stored before the job is
  queued. swarm-ui's create-agent form gets a permissions field.
- Deleted: HIVE_TOOL_GROUPS and its forward to the subagent daemon,
  tool_groups.rs, ruth's tool-group seed, the permissions rebuild job
  (PermPayload/WritePermFile/perm_change), the dashboard permissions tab
  and its stale-entries panel.

Part of #5170.

hive-c0re/src/job_queue/tests.rs

@@ -1515,38 +1515,6 @@ fn destroy_container_must_not_suppress_crash_watch() {
     );
 }
 
-#[test]
-fn perm_change_shape_prefixes_rebuild_chain() {
-    let q = JobQueue::new(1);
-    insert(&q, |builder| {
-        templates::perm_change(
-            builder,
-            "agent-a",
-            PermPayload::ToolGroups { groups: vec![] },
-        );
-    });
-    assert_eq!(
-        declared_shape(&q)
-            .iter()
-            .map(|d| d.kind)
-            .collect::<Vec<_>>(),
-        vec![
-            "write_perm_file",
-            "meta_sync",
-            "agent_window",
-            "prebuild",
-            "stop_for_update",
-            "swap",
-            "rebuild_bookkeeping",
-            "reconcile",
-            // the ok / !ok tail pair
-            "emit_rebuilt",
-            "emit_rebuilt",
-        ],
-        "the perm write prefixes an otherwise ordinary rebuild chain"
-    );
-}
-
 // ---- standalone sweeps ----
 
 #[test]