docs+comments: say what changed instead of tagging the tracker item

The prose added by this branch named the tracker item in seventeen
places, which check-issue-refs.sh rejects: a `#N` tag is dead weight for
anyone reading the public mirror, where no issue data exists. Each one
now states the fact it was pointing at — the parent field is gone — so
the sentence stands on its own.

Two of those lines also carried a rustdoc break: `[`write`]` in
topology.rs is ambiguous between the module's own `write` fn and the
`write!` macro, which `-D rustdoc::broken-intra-doc-links` fails. Spelled
`[`write()`]`, per rustdoc's own suggestion.

The host_config.rs rewrite is two lines rather than three so the doc
block stays under check-comment-blocks.sh's 30-line ceiling.

docs/agent-lifecycle/agent-hierarchy.md

@@ -2,8 +2,8 @@
 
 <!-- vale write-good.Passive = NO -->
 
-Agents are a **flat set**, with no parent/child tree: #4472 removed the
+Agents are a **flat set**, with no parent/child tree: the `parent` field
-`parent` field `topology.json` used to carry, and every mechanism that
+`topology.json` used to carry is gone, along with every mechanism that
 read it. The capability store scopes which agents can manage which
 others; a tree position no longer scopes anything.
 
@@ -33,7 +33,7 @@ agent's `state` read-write and `config` read-only; never `harness`). An
 agent holding no capability sees its own dirs and nothing else. See
 [`persistence.md`](persistence.md)'s _Cross-agent access to state._
 
-### Reading the pre-#4472 format
+### Reading the legacy format
 
 `topology.json` used to be a map of `name → parent | null`. The reader
 still accepts that shape and keeps its keys, so a hive upgrading across

docs/agent-lifecycle/persistence.md

@@ -344,8 +344,8 @@ The RW on `state` is deliberate, not an oversight: the holder recovers
 other agents, which includes writing into their state (for example
 seeding notes, clearing a stuck sentinel) as well as reading it.
 
-This is the **only** cross-agent mount. #4472 removed the topology
+This is the **only** cross-agent mount. Dropping the topology parent
-parent field, and with it the unconditional grant every agent used to
+field took with it the unconditional grant every agent used to
 get over its own direct children — an agent holding no capability now
 sees its own dirs and nothing else.
 
@@ -395,8 +395,8 @@ Contents:
 - `topology.json` — the agent roster (`["alice", "bob", "ruth"]`).
   Written by `topology::reconcile` on every meta sync; read by
   `topology::all_agents`, which is the set the `ManageRootAgent`
-  capability grants mounts over. Carried a `parent` per agent until
+  capability grants mounts over. Carried a `parent` per agent in the
-  #4472; the reader still accepts that shape and keeps its keys.
+  legacy format; the reader still accepts that shape and keeps its keys.
 - `tool-groups.json` — per-agent MCP tool group grants
   (`{ "alice": ["messaging", "inbox", "execution"] }`). Written by
   `tool_groups::set_groups`; injected as `HIVE_TOOL_GROUPS` env

docs/process/conventions.md

@@ -89,8 +89,8 @@ angle-bracket and asterisk shapes below are structurally safe.
   inbox view; no agent ever `recv`'s them.
 
 `<parent>` and `<children>` were two more, resolved against a
-`topology.json` parent field. #4472 removed that field and both
+`topology.json` parent field. That field and both sentinels no longer
-sentinels with it: address `operator` where you would have said
+exist: address `operator` where you would have said
 `<parent>`, and name the recipients (or broadcast to `*`) where you
 would have said `<children>`. Nothing rewrites a recipient at send time
 any more — what an agent passes is what the broker stores.

docs/web-ui/dashboard.md

@@ -59,8 +59,8 @@ surfaces, not tab panes.
 **C0NTAINERS** — live containers rendered as a flat,
 alphabetically-sorted list. The renderer still walks
 `ContainerView.parent` for a depth-first tree with ASCII glyphs
-(`├─`, `└─`, `│  ` continuation columns), but #4472 removed that field,
+(`├─`, `└─`, `│  ` continuation columns), but that field no longer
-so every row sits at depth 0 and the renderer paints no glyph. The tree
+exists, so every row sits at depth 0 and the renderer paints no glyph. The tree
 sorts alphabetically;
 roots likewise. The tree tolerates cycles in the parent graph —
 it appends orphaned containers (not reachable from any root)
@@ -981,7 +981,7 @@ identically.)
 
 ### Topology tree
 
-⚠️ **Dormant since #4472,** which removed `ContainerView.parent`:
+⚠️ **Dormant now that `ContainerView.parent` no longer exists:**
 `buildAgentTree` now puts every container at depth 0 and the rules below are
 all no-ops — the list renders flat. The walk and the prefix painting are
 still in `swarm.js`; retiring them falls to the frontend owner rather
@@ -1032,8 +1032,8 @@ frosted-mauve bar slides up from the bottom of the viewport
   - `DESTR0Y` / `PURG3` — always available
 <!-- vale write-good.Passive = YES -->
 
-  #4472 removed the `M0V3` picker that used to sit here — an agent has
+  The `M0V3` picker that used to sit here no longer exists — an agent
-  no parent to move it to any more.
+  has no parent to move it to any more.
 - **`✕ clear`** button + `Esc` key clear the entire selection.
 
 Every render prunes stale selections (agents destroyed while

hive-agent-mcp/src/send_allow.rs

@@ -25,7 +25,7 @@ pub fn check_send_allowed(to: &str) -> Result<(), String> {
         //
         // This bypass used to be spelled `<parent>`, which the broker
         // resolved per `topology.json` and which fell back to `operator`
-        // for a root agent. #4472 removed the parent field, so every
+        // for a root agent. The parent field is gone now, so every
         // agent is what that fallback called a root — the exemption is
         // now written as the name it always resolved to. Same reachable
         // set, one fewer indirection.

hive-agent/src/main.rs

@@ -282,7 +282,7 @@ trait Surface {
     /// of a container: this is where a turn failure or a plugin-install
     /// failure surfaces when nothing inside the harness can act on it.
     ///
-    /// Was `<parent>` before #4472, a sentinel the broker resolved per
+    /// Was `<parent>` while the hierarchy existed, a sentinel the broker resolved per
     /// `topology.json` and which already fell through to `operator` for a
     /// root agent. With the parent field gone every agent takes that
     /// branch, so the recipient is written out rather than resolved.

hive-c0re/src/agent_config/topology.rs

@@ -6,7 +6,7 @@
 //! **There is no hierarchy here any more.** The file used to be a map of
 //! `name → parent | null` and this module owned the parent/child tree that
 //! fed `<parent>` / `<children>` routing, the reparenting API and the
-//! dashboard's tree view. All of that is gone (#4472); what the file is
+//! dashboard's tree view. All of that is gone; what the file is
 //! *for* now is the one thing that survived the removal — naming every
 //! agent, which is the set a
 //! [`hive_sh4re::permissions::Capability::ManageRootAgent`] holder gets
@@ -28,8 +28,8 @@ pub fn topology_path() -> PathBuf {
     crate::paths::meta_root().join(TOPOLOGY_FILE)
 }
 
-/// On-disk shapes [`read`] accepts. The array is what [`write`] emits; the
+/// On-disk shapes [`read`] accepts. The array is what [`write()`] emits; the
-/// map is the pre-#4472 `name → parent | null` format, kept readable so a
+/// map is the legacy `name → parent | null` format, kept readable so a
 /// hive that upgrades across this change keeps its roster instead of
 /// blanking it until the next `reconcile` pass — and a blank roster is not
 /// a cosmetic gap, it is every `ManageRootAgent` holder losing its mounts
@@ -204,7 +204,7 @@ mod tests {
     }
 
     /// The upgrade path. A hive whose `topology.json` still carries the
-    /// pre-#4472 `name → parent` map must read as the same roster, parent
+    /// legacy `name → parent` map must read as the same roster, parent
     /// values discarded — otherwise the first read after the upgrade hands
     /// `ManageRootAgent` holders an empty mount set.
     #[test]

hive-c0re/src/job_queue/exec.rs

@@ -862,8 +862,8 @@ async fn run_deploy_tail(
 /// flake affects — the fan-out set for `MetaUpdate` DAGs. Empty
 /// `inputs` or any input under `hyperhive` → every container;
 /// otherwise just the agents named by `agent-<name>` inputs.
-/// Sorted by name — #4472 removed the parent field the old depth sort
+/// Sorted by name — the parent field the old depth sort keyed on is
-/// keyed on, and with every agent a root that sort already reduced to
+/// gone, and with every agent a root that sort already reduced to
 /// this.
 ///
 /// `inputs` is the caller-supplied flake-input-name list (the dashboard's

hive-c0re/src/lifecycle/host_config.rs

@@ -92,8 +92,8 @@ fn config_bind_source(name: &str) -> PathBuf {
 /// directories so nspawn doesn't refuse to start; missing dirs are
 /// non-fatal.
 ///
-/// The only caller left is the `ManageRootAgent` grant — #4472 removed the
+/// The only caller left is the `ManageRootAgent` grant; the parent/child
-/// parent/child tree that used to hand every agent its own children here.
+/// tree that handed every agent its own children here is gone.
 ///
 /// **Three dirs, three different answers** — the uniformity of the
 /// original loop is what hid that:
@@ -335,8 +335,8 @@ async fn set_nspawn_flags(
     // now says so out loud instead of deriving it from a field that no
     // longer discriminates.
     //
-    // This is the *only* cross-agent mount left. #4472 dropped the
+    // This is the *only* cross-agent mount left. Dropping the topology
-    // topology parent field, and with it the unconditional grant every
+    // parent field took with it the unconditional grant every
     // agent used to get over its own direct children — so an agent with
     // no capability now sees its own dirs and nothing else.
     if crate::capabilities::has_cap(agent_name, Capability::ManageRootAgent) {

hive-c0re/src/workers/auto_update.rs

@@ -267,8 +267,8 @@ pub async fn run(coord: Arc<Coordinator>) -> Result<()> {
 
     let current_rev = current_flake_rev(&coord.hyperhive_flake);
 
-    // Resolve container names to logical agent names, then sort. #4472
+    // Resolve container names to logical agent names, then sort. The
-    // removed the parent field this used to depth-sort by; with no
+    // parent field this used to depth-sort by is gone; with no
     // hierarchy left to respect, alphabetical is the whole order — and it
     // is exactly what the depth sort already produced once every agent
     // was a root.