SSOT

Enforce exactly one writable authority for each necessary fact, policy, schema,
contract, configuration value, or generation contract. Every other form is a typed
consumer, deterministic projection, disposable cache, or evidence—never a competing
writer or fallback owner.

A canonical calculated default is one owned fact. Declare and validate it once at the
typed owner; consumers omit equal environment variables, settings, parameters,
arguments, fixtures, and projections. Only a current non-derivable external value or a
supported override is explicit.

Consume the current concept set from yagni and read the authority procedure (skill
file). Return one authority map for implementation, solid, and dry; search-first
owns the global route.

Missing ownership, precedence, generator, consumer, or runtime evidence blocks mutation.
File names, docs, tests, caches, and runtime observations do not become owners by
convenience.