The skill carries the reliability rules, but nothing an agent loads by default
said that specs run concurrently at all. The testing policy described tiers and
evidence without ever stating how a spec is executed, and neither subtree
AGENTS.md mentioned it — including scripts/, where the two suites that recently
failed on unrelated branches live.
docs/testing.md gains the execution model as the one home for the fact: forked
workers, concurrent coverage partitions beside other gates, and self-hosted
runners sharing a host and volume, with the rule that a spec passing only when
run alone is a defect in the spec. It links the skill for the detailed rules.
packages/AGENTS.md and scripts/AGENTS.md carry the short actionable form and
link that section, so the rule is present in the context loaded while a test in
either subtree is being written.
Both ceilings are raised for the added words and the targets in docs/AGENTS.md
move with them: docs/testing.md 1150 to 1300 (now 1237) and packages/AGENTS.md
675 to 750 (now 712), each keeping the 5% headroom the standard requires.
Yichen Jiang