mutability (living / frozen / sealed)

The scale of how much an artifact may change over its life — living (revised freely), frozen (changed only by override), or sealed (never again).

The axis naming how an artifact changes over its life living — revised in place (README, overview, seed by dated revision, the Basis of Design) frozen — not edited in place, changed only by a superseding addendum (system design); thaw-able through the addendum mechanism, still governs the build

sealed — final, the text never changes (closed hos, sidequests, addenda, dogfood findings, devlogs/Reflect, executed ATs, propagation-ledger commits, sealed decisions); reopening carries gravity — a sealed record is history (a future document may respond, nothing supersedes it in force), a sealed decision's force yields only to a deliberate, recorded supersession Forward-only governs frozen and sealed; living is the declared exception — and the state memory (Kamae 6) is living and non-canonical: the hot posture.