§22 S6: type-driven entry noun (§22.4a) — backend source of truth + chrome

The displayed noun for an entry is a framework concept keyed on the collection's
immutable type — document→"RFC", specification→"Spec", bdd→"Feature" — not
deployment content. The chrome reads it from the API instead of hardcoding "RFC".

- collections.ENTRY_NOUN + entry_noun(type) (unknown type → generic "RFC").
- Surfaced as entry_noun on get_collection, list_collections items, the
  /api/deployment directory items, and GET /api/projects/:id.
- Frontend: Catalog reads entry_noun for the "+ Propose New <noun>" control;
  ProposeModal fetches the active collection's noun for its title + field copy.
- test_s6_entry_noun_vertical.py: map + API surfacing (collection + directory).

Scope note: this is §22.4a item (2) — terminology. The deeper type-module work
(item 1 per-type frontmatter schemas; item 3 specification release-planning +
bdd scenario/coverage surfaces) is flagged OPEN in the design doc and is handed
off to a follow-up spec+slice.

Backend 528 passed; frontend 30 passed + build green. Part of v0.45.0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/app/api_deployment.py

@@ -78,6 +78,11 @@ def make_router(config: Config, gitea: Gitea, bot: Bot) -> APIRouter:
                 "type": collections_mod.collection_type(
                     collections_mod.default_collection_id(r["id"])
                 ),
+                "entry_noun": collections_mod.entry_noun(
+                    collections_mod.collection_type(
+                        collections_mod.default_collection_id(r["id"])
+                    )
+                ),
                 "visibility": r["visibility"],
             }
             for r in rows
@@ -221,6 +226,7 @@ def make_router(config: Config, gitea: Gitea, bot: Bot) -> APIRouter:
             "name": row["name"],
             "tagline": (dep["tagline"] if dep else "") or "",
             "type": collections_mod.collection_type(cid),
+            "entry_noun": collections_mod.entry_noun(collections_mod.collection_type(cid)),
             "visibility": row["visibility"],
             "initial_state": collections_mod.collection_initial_state(cid),
             "theme": cfg.get("theme") or {},