feat: forall/exists quantifiers + reachable graph traversal (PLE Phase 2)#134
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feat: forall/exists quantifiers + reachable graph traversal (PLE Phase 2)#134
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…s-expressions Extend the s-expression evaluator with: - forall(scope, predicate) — universal quantifier over store - exists(scope, predicate) — existential quantifier over store - count(scope) — boolean: at least one match exists - reachable-from(start, link-type) — current artifact is downstream - reachable-to(target, link-type) — target is downstream of current EvalContext now includes optional Store reference for quantifier access. All callers (CLI, API, MCP, salsa) pass store via matches_filter_with_store. Examples: rivet list --filter '(exists (= type "requirement") (has-tag "stpa"))' rivet list --filter '(reachable-from "REQ-004" "satisfies")' Implements: REQ-041 Refs: FEAT-109 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Extends the s-expression evaluator with quantifiers and graph traversal:
(forall scope predicate)— universal quantifier over the artifact store(exists scope predicate)— existential quantifier(count scope)— boolean: at least one match(reachable-from "REQ-004" "satisfies")— current artifact is reachable from start via link type(reachable-to "TEST-090" "verifies")— target reachable from current artifactEvalContext extended with optional Store reference. All callers updated to pass store.
Examples
Implements: REQ-041
Refs: FEAT-109
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