feat: evalWarm (warm-cache eval) + recordedDeps#1
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…ntical, S1 machinery)
…ancements - README: document evalWarm and recordedDeps (signatures, semantics, examples), add them to the ToC, and add an Acar (self-adjusting computation) provenance row - README: fold in the neron traversal-order stable-contract note and the "D over I over P" wording, and refresh the test count (163 tests / 19 suites) - lib/eval.nix: rewrite the new-primitive comments in house style — drop project-internal seam labels, spec-section refs, and brittle line-number references; keep the Acar citation
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Two additive pure-Nix evaluator primitives in
lib/eval.nix. Purely additive —eval/evalDebugbehaviour is unchanged, and the existing suites stay byte-green.evalWarm— relocatable warm-cache evaluator for incremental re-evaluation. A leaf attribute of a clean node (isClean id) whose value is present inpriorResultsis served from the cache without forcing its compute function; everything else evaluates cold.children/derived-childrenare never warm-served — tree structure is always recomputed, so a dirty descendant stays reachable through freshly-materialized parents. Thin wrapper overeval: they share the per-attribute evaluator (evalAttr), andevalcarriespriorResults/isCleanas warm-off defaults, soevaland warm-offevalWarmare byte-identical. (Informed by Acar's self-adjusting computation.)recordedDeps— first-class projection of a consumer's declared read-edges (declaredEdges id). Pure and memo-free. The dynamic read-set is only recoverable viaevalDebug's fresh-self-per-get, which defeats memoization, so the declared edges are the inspectable contract.The first commit factors the duplicated root/child attribute loops into one shared
evalAttrwith optional warm params —evalstays byte-identical (the existingevalsuite gates it).163 tests (152 existing + 11 new across the
eval-warmandrecorded-depssuites), TDD red-first, treefmt-clean.