fix tracker-tag lint and vale prose reds on #4624

Rewrite two bare issue references (#4472, #4477) as self-standing
prose per check-issue-refs.sh's requirement — no markdown exemption,
hash-number tags are dead weight to a public forge-mirror reader.

Apply iris's vale fix to docs/agent-lifecycle/approvals.md (passive
voice, two contractions, one auto- hyphenation).

hive-c0re/src/lifecycle/host_config.rs

@@ -334,7 +334,7 @@ async fn set_nspawn_flags(
     // accident of how the set is computed. The grant used to hang off a
     // `can_manage_top_level_agents` role and cover `top_level_agents()`
     // — i.e. `parent.is_none()` — which was "everything outside the
-    // hierarchy". With the hierarchy gone (#4472) every agent is
+    // hierarchy". With that hierarchy removed, every agent is
     // parentless, so that set *was* every agent anyway; the capability
     // now says so out loud instead of deriving it from a field that no
     // longer discriminates.

hive-c0re/src/workers/auto_update.rs

@@ -211,7 +211,7 @@ fn should_seed_manager_caps(store_written: bool) -> bool {
 /// `topology::reconcile_roles` seeded `can_manage_top_level_agents` onto
 /// `MANAGER_NAME` on every meta sync, and that role is what put the other
 /// agents' state/config dirs, `/applied` and `/meta` into her nspawn binds.
-/// #4477 collapsed the role into the capability, so without a seed here she
+/// Collapsing the role into the capability means that without a seed here she
 /// loses those recovery mounts at her next container rebuild — silently, and
 /// only then, because nspawn bakes bind flags at container start.
 ///