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/connection/src/http-bridge.ts

@@ -30,9 +30,13 @@ export async function bridge(
   })
   const declaredLength = req.headers['content-length']
   if (declaredLength !== undefined && Number(declaredLength) > maxRequestBodyBytes) {
-    res.writeHead(413)
+    // Same discipline as the chunked-overrun path below: destroy, never
+    // drain. resume() would keep the socket open while the client trickles
+    // its declared length — an already-rejected request holding a server
+    // socket for as long as it likes.
+    res.writeHead(413, { connection: 'close' })
     res.end()
-    req.resume()
+    req.destroy()
     return
   }
   const chunks: Buffer[] = []