§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>

frontend/src/components/ProposeModal.jsx

@@ -12,7 +12,7 @@
 // success navigates the proposer to the pending-idea view per §9.3.
 
 import { useEffect, useRef, useState } from 'react'
-import { proposeRFC, suggestTags } from '../api'
+import { proposeRFC, suggestTags, getCollection } from '../api'
 import { EVENTS, track } from '../lib/analytics'
 
 // How long the draft must sit unchanged before we ask for suggestions —
@@ -33,6 +33,9 @@ export default function ProposeModal({ viewer, onClose, onSubmitted, initialTitl
   // (App passes the `?propose=<term>` value here); the slug derives from it
   // via the same effect that drives manual typing.
   const [title, setTitle] = useState(initialTitle)
+  // §22.4a: the type-driven noun for the active collection ("RFC" | "Spec" |
+  // "Feature"), read from the API. Defaults to "RFC" until the collection loads.
+  const [entryNoun, setEntryNoun] = useState('RFC')
   const [slug, setSlug] = useState('')
   const [slugEdited, setSlugEdited] = useState(false)
   const [pitch, setPitch] = useState('')
@@ -53,6 +56,17 @@ export default function ProposeModal({ viewer, onClose, onSubmitted, initialTitl
     if (!slugEdited) setSlug(slugify(title))
   }, [title, slugEdited])
 
+  // §22.4a: resolve the active collection's entry noun so the modal chrome
+  // names entries per the collection type. Best-effort; falls back to "RFC".
+  useEffect(() => {
+    if (!projectId || !collectionId) return
+    let live = true
+    getCollection(projectId, collectionId)
+      .then(c => { if (live) setEntryNoun(c?.entry_noun || 'RFC') })
+      .catch(() => {})
+    return () => { live = false }
+  }, [projectId, collectionId])
+
   // #27: debounced tag-suggestion fetch. Fires after the draft sits
   // unchanged for SUGGEST_DEBOUNCE_MS, only once there's something to go
   // on (a title). A stale-response guard keeps an earlier in-flight
@@ -116,7 +130,7 @@ export default function ProposeModal({ viewer, onClose, onSubmitted, initialTitl
     <div className="modal-overlay" onClick={e => { if (e.target === e.currentTarget) onClose() }}>
       <div className="modal">
         <div className="modal-header">
-          <h2>Propose a New RFC</h2>
+          <h2>Propose a New {entryNoun}</h2>
           <button className="modal-close" onClick={onClose}>×</button>
         </div>
         <form onSubmit={handleSubmit}>
@@ -130,7 +144,7 @@ export default function ProposeModal({ viewer, onClose, onSubmitted, initialTitl
               autoFocus
               required
             />
-            <p className="field-help">The word or topic this RFC will define.</p>
+            <p className="field-help">The word or topic this {entryNoun} will define.</p>
 
             <label htmlFor="propose-slug">Slug</label>
             <input
@@ -142,22 +156,22 @@ export default function ProposeModal({ viewer, onClose, onSubmitted, initialTitl
             />
             <p className="field-help">Auto-derived from the title; edit if needed.</p>
 
-            <label htmlFor="propose-pitch">Why is this RFC needed?</label>
+            <label htmlFor="propose-pitch">Why is this {entryNoun} needed?</label>
             <textarea
               id="propose-pitch"
               value={pitch}
               onChange={e => setPitch(e.target.value)}
-              placeholder="One or two paragraphs answering 'why this RFC is needed.'"
+              placeholder={`One or two paragraphs answering 'why this ${entryNoun} is needed.'`}
               rows={5}
               required
             />
 
-            <label htmlFor="propose-use-case">What will you be using this RFC for? (optional)</label>
+            <label htmlFor="propose-use-case">What will you be using this {entryNoun} for? (optional)</label>
             <textarea
               id="propose-use-case"
               value={useCase}
               onChange={e => setUseCase(e.target.value)}
-              placeholder="The concrete thing you intend to build or do with this RFC. Optional, but it helps ground the work."
+              placeholder={`The concrete thing you intend to build or do with this ${entryNoun}. Optional, but it helps ground the work.`}
               rows={3}
             />
             <p className="field-help">