refactor(#3034): rename PostSwap to RebuildBookkeeping

It reads as a swap thing but is post-*rebuild* bookkeeping: rev marker, forge and
matrix sync, manager kick, container rescan, meta-inputs snapshot. Wire label
follows (`post_swap` -> `rebuild_bookkeeping`); the graph view renders whatever
label it is sent, so nothing keys on the old string.

Also corrects a doc the previous commit falsified: this node's comment still said
it declares the agent lease as a re-entrant borrow, after that declaration moved
to the brace. Clippy and the whole suite pass over a stale doc comment, so it
took reading the file to find.

Verified by grepping the new name for places it has no business being, which
caught the sed rewriting a *historical* test name in a `// Replaces ...` comment
- reverted, since prose about the past must keep its old spelling.

hive-c0re/src/actions.rs

@@ -867,7 +867,7 @@ async fn prepare_applied_target(
 /// [`run_deploy_tail`] must not roll `main` back. Ordering that ahead of the tag
 /// plant is what makes the tail's `deployed/<id>` cross-check a second line of
 /// defence rather than the only one. No agent kick — the rebuild's own
-/// `PostSwap` already did it.
+/// `RebuildBookkeeping` already did it.
 ///
 /// # Errors
 ///