fix: address ds-review-bot v8 findings

- llm-deepseek: the uncatalogued resolveModel fallback declares text-only
  modalities — the wire route is text-only regardless of catalog
  membership, so "unknown" must not let the host persist-then-fail images.
- session.selectModel also consults the pending-inbox mirror: a queued
  image prompt enters the log only when claimed, after a switch would land.
- attachment store: ensureDurableDirectory syncs every ancestor entry up to
  a caller-vouched boundary regardless of what mkdir reports — a raced
  "already existed" is not "already durable".
- One image walker (imageBlockIn/imageInEvent) now serves both attachment
  authorization and the selection gate; referencedImage therefore also
  authorizes references inside wrapped message content.
- InputHub: the scope disposer resolves the conversation service optionally
  (teardown/HMR must reach quiescence), and a send failing after its scope
  died releases the in-flight drafts instead of restoring them onto a
  disposed shell.
- http-bridge destroys declared-oversize requests with connection: close
  instead of draining a body the client can trickle indefinitely.
- LlmService validates AND detaches modality arrays identically on the
  advisory and exact routes; READMEs record the fourth INVALID_MODEL_INFO
  rejection reason.
- CLI provider docs (JSDoc, README pair, Agent Note pair) describe the
  reuse behavior; llm-route.spec now parses the SHIPPED cordis.yml through
  the production extraction, pinning the row coupling.
- image-display lane pins gallery/rail shape in inline snapshots and the
  object-URL scheme this environment must take; stale host.schema comment
  dropped.

packages/client/ui-conversation/src/client/input/hub.ts

@@ -87,11 +87,17 @@ export class InputHub implements InputService {
         for (const off of offs) off()
         // Draft attachments die with the scope: the shell only holds ids, so
         // the service-owned File objects and object URLs must be released
-        // here or they leak for the page lifetime.
+        // here or they leak for the page lifetime. The lookup is optional —
+        // during application teardown or HMR of this plugin the root
+        // `conversation` service can already be unregistered while session
+        // scopes are still alive; a throwing disposer would abort teardown
+        // quiescence, and the service's own disposal effect revokes every
+        // remaining URL in that case anyway.
         const drafts = shell.snapshot.imageIds
         shell.dispose()
         this.shells.delete(id)
-        for (const imageId of drafts) this.conversation().releaseDraftImage(imageId)
+        const conversation = this.rootCtx.get('conversation') as ConversationAttachmentFace | undefined
+        for (const imageId of drafts) conversation?.releaseDraftImage(imageId)
       }
     }, 'conversation.input: session shell')
     return shell
@@ -139,8 +145,18 @@ export class InputHub implements InputService {
     // Commit, not an editable clear: undo must not resurrect sent content.
     shell?.commitSend(imageIds)
     void this.conversation().sendSession(session, text, mode, imageIds).catch(() => {
-      shell?.restoreImages(imageIds)
-      if (shell?.snapshot.draft === '') shell.setDraft(text)
+      // Restore only into the shell that still owns the session: if the scope
+      // died while the send was in flight, `commitSend` already removed the
+      // ids from the (now disposed) shell, so the teardown release could not
+      // see them — release the drafts here instead of resurrecting them onto
+      // a dead instance where they would leak for the page lifetime.
+      if (this.shells.get(session.sessionId) === shell) {
+        shell?.restoreImages(imageIds)
+        if (shell?.snapshot.draft === '') shell.setDraft(text)
+        return
+      }
+      const conversation = this.rootCtx.get('conversation') as ConversationAttachmentFace | undefined
+      for (const id of imageIds) conversation?.releaseDraftImage(id)
     })
   }