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.

swarm-queue-client/Cargo.toml

@@ -50,9 +50,10 @@ schema = ["dep:utoipa"]
 # `agent_limits::read`, for hive-c0re, which reads the key of each agent it
 # runs the same way. Explicit for the same reason as `notices`.
 agent-limits = ["async-nats/jetstream"]
-# `agent_permissions::AgentPermissions` and `read`, for hive-c0re and
-# swarm-controller. Pulls `hive-sh4re` for the `Capability` names, so the
-# crates that only need the bucket name do not link it.
+# `agent_permissions::AgentPermissions` and `read`, for hive-c0re, the agent
+# harness, the subagent daemon and swarm-controller. Pulls `hive-sh4re` for the
+# `Permission` names, so the crates that only need the bucket name do not link
+# it.
 agent-permissions = ["dep:hive-sh4re", "async-nats/jetstream"]
 
 [dependencies]