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idle-warm: run cmux's UI fuzzer in idle gaps with nothing left to warm (opt-in) #1343

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teamleaderleo merged 4 commits into from
Sep 28, 2026
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idle-warm: run cmux's UI fuzzer in idle gaps with nothing left to warm (opt-in) #1343

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d3b4d7c
idle-warm: run cmux's UI fuzzer in idle gaps with nothing left to war…
teamleaderleo Sep 28, 2026
01d60d0
idle-warm fuzz: review fixes (fully idle only, no root token, disk fl…
teamleaderleo Sep 28, 2026
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docs: idle fuzzing after the review fixes
teamleaderleo Sep 28, 2026
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idle-warm fuzz: trim runs a preemption cut short once past the longes…
teamleaderleo Sep 28, 2026
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12 changes: 12 additions & 0 deletions docs/CMUX_MINI_RUNNER.md
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Expand Up @@ -943,6 +943,18 @@ rebuild-tier from main's head, and each mini had sat fully idle 17 to 33% of the

Check one mini: `glaeda-idle-warm` (plan) says whether it would warm now and which root, or why not.

**Idle UI fuzzing.** With `~/.config/glaeda/idle-fuzz.enabled`, an idle spell with nothing left to warm runs
cmux's UI fuzzer (`scripts/fuzz` from the kept main checkout) instead of skipping. It clones the newest main
build a root keeps into `fuzz/builds/<sha>` (APFS `cp -c`, no root token: the copy counts only if the root's
stamp is unchanged after it), fuzzes it for up to 10 minutes and minimizes up to two failures, 26 minutes at most;
runs land in `/Users/Shared/cmux-build-fleet/fuzz/runs`. Same gates and yield as a catch-up, plus: every capacity
unit free (no admitted job at all, since a gui-step job takes the gui token only later with take-gui), this user
owns an unlocked console, no Xcode test runs, and 90 GiB free. It holds one unit through
`capacity/idle-warm.json`, never the gui token or a root (either would stop a gui runner's listener). A job's
SIGTERM ends the fuzzer and its app together: the app is the fuzzer's child, in the catch-up's process group.
`glaeda-idle-warm --apply --fuzz` runs it now. cmuxterm-hq's `build-fleet/fuzz/collect.py` files the findings
as cmux issues.

## 2l. Mini health: heal what the runner user can, report the rest

`glaeda-mini-health` (the 2-minute mini-health LaunchAgent from glaeda-mini-setup, a no-op without glaeda
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