feat(microvm): Claude Code 2.1.276 rootfs pins, and a VM run that says what it ran

Every rootfs on the fleet had sat on Claude Code 2.1.223–2.1.226 since August
while the container tier moved to 2.1.276, and nothing recorded either. GLM
and Kimi exist only as microVM backends, so "have we upgraded GLM and Kimi"
is this change and the rebuild it drives.

Pins. All four agent-* images pin 2.1.276 — as separate ARGs, since Docker has
no include and each file has to stay reproducible alone — and
scripts/fc-build-rootfs.sh refuses to build if they disagree, naming the odd
one out. They had already drifted (claude 226, the rest 223) under comments
saying "same version on purpose". Between 2.1.226 and 2.1.276, 2.1.265 and
2.1.275 each broke every turn on ANTHROPIC_BASE_URL endpoints, which is how
glm and kimi reach `claude` inside a VM; the container-tier verification never
exercised that path, so the VM runs on those backends are the real test.

Provenance. `VmOutcome` carries the rootfs the node reported booting and the
guest's own `claude --version`; `launch_microvm_phase` persists both as
`checkpoint.vm` beside `records` (the two readers parse only `records`) and
names them in its log line. "Which image and CLI did this mission run on" is
a query now.

Independence. `evaluator` derived the implementer family from a constant
`"anthropic"`, true while every backend was Claude on Anthropic. With glm and
kimi rootfs it made a glm mission judged by glm:glm-5.3 read as
`independent = true` — the one claim that path exists to make honestly.
`implementer_family(missions.backend)` mirrors `microvm_credential_for`; the
subscription judge is now independent exactly when the agent did NOT run on
Anthropic.

Harness. `verify-mission-delivery.sh glm|kimi` run the microvm scenario on
each backend and add the proof the mission itself cannot give: the placed
node's journal must show the VM dialling that provider's host, never being
denied it, and dialling nothing else but the forge — a model's self-report is
measured worthless here. `assert_cli_version` reads checkpoint.vm. The stale
scratch-repo default (dead since the 09-14 wipe) is the re-synced id.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01WZb5A2kfVfjpdwSochkuHz

images/agent-claude/Dockerfile

@@ -27,7 +27,14 @@ FROM clawmates/agent-toolchain:dev
 # could undo. 2.1.221 also fixes `--mcp-config` servers not connecting before the
 # first turn in print mode, which is exactly the mode we run and will matter when
 # the MCP door reaches a VM.
-ARG CLAUDE_CODE_VERSION=2.1.226
+# 2.1.276, 2026-09-18. Between 2.1.226 and here, 2.1.265 and 2.1.275 each broke
+# every turn on ANTHROPIC_BASE_URL endpoints (HTTP 400) — the path the glm and
+# kimi images use — and 2.1.276 is the first version after both that is fixed.
+# All four agent-* images pin the SAME version; scripts/fc-build-rootfs.sh
+# refuses to build if they drift. Bump them together, on purpose, and run a
+# mission on each backend before promoting (see deploy/clawmates-runtime/Dockerfile
+# for the same rule on the container tier).
+ARG CLAUDE_CODE_VERSION=2.1.276
 RUN npm install -g "@anthropic-ai/claude-code@${CLAUDE_CODE_VERSION}" \
     && npm cache clean --force \
     && rm -rf /root/.npm \