All 176 files in the four accumulating directories now use a zero-padded 4-digit counter prefix that reflects creation order (`NNNN-slug.md`). The counter is assigned per directory in strict git-log creation order; ties broken alphabetically by original name. The old `YYYY-MM-DD-` prefix on docs/specs/ and docs/plans/ files is dropped — the date is recoverable from git log and the counter carries the ordering. A file's counter is stable for the life of the file: never reassigned, never reused, never compacted. Deleted files retire their counter; subsequent files do not fill the gap. This is the property that lets cross-references stay literal — refs use the full filename including the counter (`design/contracts/0007-honesty-rule.md`) so they grep cleanly and resolve directly without a glob step. 313 cross-references updated across .md/.rs/.toml/.c/.json files (test pins, include_str! paths, design-INDEX entries, baseline notes, runtime C comments, inter-contract markdown links incl. bare basename and `../models/foo.md` forms). CLAUDE.md gets a new "File-naming convention" section spelling out the rule and rationale. skills/brainstorm/SKILL.md and skills/planner/SKILL.md updated so new spec/plan creation produces counter-prefixed names from the start. The full test suite (cargo test --workspace) passes.
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Effects — pure core + algebraic effects
Pure core language + algebraic effects
The default is total, pure functions. Effects are declared as a set in the
function type: (Int) -> Int ![IO]. The effect set is a
flat, unordered, closed set of effect names, unified by set-equality —
there is no effect row variable; a signature lists exactly the effects
its body may perform. The schema-level effect-set field on Type::Fn
is documented in Data model; what is
currently in scope vs. excluded lives in
scope boundaries.
In the MVP only the effect IO is wired up (its sole op is io/print_str).
Diverge (for non-termination) is reserved as an effect name but is
unimplemented — no op, no codegen, no checker injection — in the same
sense the refinements layer is reserved as a future extension without
present-day surface (see
scope boundaries).
This is the most important LLM property: when I read a function, I can trust its signature without reading the body.