fix(ci): unblock nix flake check after clippy 0.1.95 bump (#1368)

The nixpkgs bump to clippy 0.1.95 / cargo 1.95.0 added + strengthened a
large batch of lints. CI denied ALL warnings (`-D warnings`) against the
`pedantic = warn` workspace lint, so the bump hard-failed `nix flake
check` workspace-wide with zero code changes — and would recur on every
future clippy bump.

Posture fix (the durable part): CI now runs
`-D warnings -A clippy::pedantic`, so the default/correctness/style lints
stay a hard gate while the "extra, opinionated" pedantic group is
advisory only (still `warn` for local `cargo clippy` via the workspace
lints table, just non-blocking in CI). `-A` rather than `-W` so the
group drop doesn't re-enable the specific pedantic lints the workspace
allows (e.g. `must_use_candidate`).

Also fixes the genuine DEFAULT/STYLE lints the bump surfaced across the
workspace (doc_lazy_continuation, collapsible_if, ptr_arg,
match_like_matches_macro, …) via `cargo clippy --fix` + manual stragglers
(`too_many_arguments` #[allow] on the host-config constructors), and
three tests that had rotted while the CI runner was offline (#1221):
- topology::top_level_agents_in_multi_root — hardcoded unsorted expected
- rebuild_queue::depends_on_evicted_dep_counts_as_resolved — needs
  MAX_HISTORY_PER_KIND newer terminals to evict, not one
- coordinator::agent_paths doctest — illustrative pseudo-code, now `ignore`

Validated: clippy + formatting + cargo-test checks all pass.

hive-c0re/src/topology.rs

@@ -665,7 +665,9 @@ mod tests {
         topo.insert("orphan".to_owned(), None);
         let mut top = top_level_agents_in(&topo);
         top.sort();
-        assert_eq!(top, vec![crate::lifecycle::MANAGER_NAME, "orphan"]);
+        let mut expected = vec![crate::lifecycle::MANAGER_NAME, "orphan"];
+        expected.sort();
+        assert_eq!(top, expected);
     }
 
     #[test]
@@ -741,7 +743,7 @@ mod tests {
     #[test]
     fn reconcile_roles_in_does_not_reseed_after_explicit_revoke() {
         let mgr = crate::lifecycle::MANAGER_NAME;
-        let agent_names = vec![mgr.to_owned(), "alice".to_owned()];
+        let agent_names = [mgr.to_owned(), "alice".to_owned()];
         let mut roles: BTreeMap<String, Vec<String>> = BTreeMap::new();
         // Tombstone: manager was seen before but all roles were revoked.
         roles.insert(mgr.to_owned(), vec![]);
@@ -759,7 +761,7 @@ mod tests {
     #[test]
     fn reconcile_roles_in_seeds_root_when_absent() {
         let mgr = crate::lifecycle::MANAGER_NAME;
-        let agent_names = vec![mgr.to_owned(), "alice".to_owned()];
+        let agent_names = [mgr.to_owned(), "alice".to_owned()];
         let roles: BTreeMap<String, Vec<String>> = BTreeMap::new(); // empty
 
         let should_seed = agent_names.iter().any(|n| n == mgr) && !roles.contains_key(mgr);