runpod: bake the image tag into the pod, and record the whole startup in /boot

A pod could not say WHICH build it was running, which is exactly the question a
cached ':latest' raises — an images pod reported a dependency missing that had
already been published under that tag. The build now bakes IMAGE_TAG in, so the
boot record names the image.

/boot also showed only 'lifespan start': the seed registration and the end of
startup were plain prints. They are phases now, so one request covers the whole
boot including how many seeded models registered and whether that step failed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0182DhR1eFNPQyGmDrpHbedY

codai/api/app.py

@@ -140,12 +140,16 @@ async def lifespan(app: FastAPI):
                   flush=True)
         _seeds = [e for e in (getattr(_cm, "_pending_seed_entries", None) or [])
                   if isinstance(e, dict) and e.get("path")]
-        print(f"[seed] {len(_seeds)} seeded model(s) to register", flush=True)
+        boot_phase(f"registering {len(_seeds)} seeded model(s)")
         for _entry in _seeds:
             register_model_runtime(_entry,
                                    _entry.get("model_type") or "text_models")
+        if _seeds:
+            boot_phase("seeded models registered: "
+                       + ", ".join(str(e.get("alias") or e.get("path"))
+                                   for e in _seeds)[:200])
     except Exception as _exc:
-        print(f"[seed] could not register seeded models: {_exc}", flush=True)
+        boot_phase(f"SEED REGISTRATION FAILED: {_exc}")
 
     # Start any RunPod pod configured to stay warm. Pools are otherwise created
     # on first use, so the first request after a restart would still pay the cold
@@ -159,6 +163,8 @@ async def lifespan(app: FastAPI):
     except Exception:
         pass
 
+    boot_phase("startup complete — accepting requests")
+
     yield
 
     if broker_service is not None:

packaging/runpod/Dockerfile.capability

@@ -23,6 +23,12 @@ FROM ${CORE_BASE}
 ARG PROFILE=images
 ARG TORCH_INDEX=https://download.pytorch.org/whl/cu124
 ENV PROFILE=${PROFILE}
+# Baked at build time so the pod can say WHICH build it is. A machine may serve
+# a cached `:latest`, and an images pod once reported a dependency missing that
+# had already been published under that tag — with no way to tell from outside
+# whether the pod ran the new image or an old one. Now it says so at boot.
+ARG IMAGE_TAG=unknown
+ENV CODERAI_IMAGE_TAG=${IMAGE_TAG}
 
 WORKDIR /opt/coderai/app
 COPY packaging/runpod/profiles/ /tmp/profiles/

packaging/runpod/build_capability_image.sh

@@ -57,6 +57,7 @@ echo "==> building $TAG from profile '$PROFILE'"
 # BuildKit for the pip cache mount: nine profiles, one torch download.
 DOCKER_BUILDKIT=1 docker build -f packaging/runpod/Dockerfile.capability \
     --build-arg "PROFILE=$PROFILE" \
+    --build-arg "IMAGE_TAG=$TAG" \
     --build-arg "CORE_BASE=$CORE_BASE" \
     -t "$TAG" .