Agent-context budget test fails on main: notebook tools grew the MCP tool list #259

apps/server/src/provider/AgentContextBudget.test.ts fails on main at f5193b5. The MCP tool list measures 72,356 bytes against the recorded 66,878. The difference (+5,478 bytes) is the ten notebook tools from #249 (#213), whose delivery measured +5,308 schema characters and +2,508 description characters in its free eval context check. That PR didn't update agentContextBudget.json. The Claude system append and Codex additional context are unchanged.

Done means: agentContextBudget.json records the measured 72,356, the test passes, and the commit names the notebook tools as the cause. The tool text isn't cut: #213's free eval dry runs already covered it.