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The chain climbs experimental-silo, then landing-silo, then main: a change is attempted in testing before it becomes a nightly candidate for stable. The document had the two silos the other way round, which is how the Fronius work ended up one rung below stable while it had only ever been verified against the bench simulator. Corrected in the diagram, the promotion criteria, the fix table and its downward path, the packaging channel list and the agent rules. The channel each branch feeds is unchanged: experimental-silo is testing, landing-silo is nightly. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>