refactor(hive-c0re): drop the request_init_config tool and InitConfig approval

swarm-controller's `InitAgentConfigRepo` node already covers config-repo
creation, so this deletes a duplicate rather than a capability; old
`init_config` rows are skipped by `collect_lenient` with no migration, by
operator decision.

Refs #4398

docs/agent-lifecycle/persistence.md

@@ -58,7 +58,7 @@ power-intent registry:
   below](#state-dirs-per-agent) for where reminders (and todos)
   actually live now.
 - `approvals` — the queue. `agent / kind (merge_config_pr | spawn |
-  init_config | update_meta_inputs | schedule_prompt) /
+  update_meta_inputs | schedule_prompt) /
   commit_ref / requested_at / status / resolved_at / note`.
 - `scheduled_prompts` — recurring + one-shot prompt queue.
   `owner / body / interval_seconds (NULL = one-shot) /
@@ -353,9 +353,9 @@ tree anyone edits in place. Mounting it writable would leave a second
 path to the same file that skips the review entirely, which makes the
 boundary a convention rather than a permission.
 
-⚠️ Not to be confused with the seeding done when an `InitConfig`
-approval resolves: that writes the child's initial config repo as
-**hive-c0re, against the host path**, and `read_only` on a bind
+⚠️ Not to be confused with the config-repo seeding hive-c0re does at
+spawn (`lifecycle::setup_proposed`): that writes the child's initial
+config repo as **hive-c0re, against the host path**, and `read_only` on a bind
 constrains writers *inside* a container only. The two are unrelated —
 conflating them can lead you to reason your way into thinking this
 mount should be writable when it shouldn't.
@@ -443,7 +443,7 @@ nothing is automigrated: existing agents keep their plain dirs
 until an explicit opt-in upgrade.
 
 - **Creation:** `lifecycle::ensure_agent_state_subvolume` runs before
-  hive-c0re creates the per-agent subdirs (spawn / rebuild / InitConfig).
+  hive-c0re creates the per-agent subdirs (spawn / rebuild).
   It skips the work when the root already exists; otherwise it asks
   hive-priv (`EnsureAgentSubvolume`) to `btrfs subvolume create` the
   root when the FS is btrfs (`statfs` magic gate) and chown it to the