wip(929): stage 9 — drop FS-archived-deps scan; story_tools/story/create.rs reads CRDT

io/watcher and io/watcher/sweep were already CRDT-only — the watcher only
watches .huskies/{project,agents}.toml, work-item events come from CRDT
subscribe — so the remaining FS shadow reader was the bug-503 archived-dep
warning in story_tools/story/create.rs (via check_archived_deps_from_list,
which scanned .huskies/work/6_archived/). Migrate that call to the
CRDT-direct `dep_is_archived_crdt`. Drop the now-unused helper and the
four dead imports in bug/spike/refactor/criteria.rs that referenced it.

io/story_metadata/deps.rs is reduced to a module-level comment pointing
callers at the crdt_state helpers; nothing in io/ now scans the FS shadow
tree.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/src/http/mcp/story_tools/bug.rs

@@ -13,7 +13,7 @@ use crate::http::workflow::{
     list_refactor_files, load_pipeline_state, load_upcoming_stories, remove_criterion_from_file,
     update_story_in_file, validate_story_dirs,
 };
-use crate::io::story_metadata::{check_archived_deps_from_list, parse_unchecked_todos};
+use crate::io::story_metadata::parse_unchecked_todos;
 use crate::service::story::parse_test_cases;
 use crate::slog_warn;
 #[allow(unused_imports)]