Persistent artifacts: FileArtifactStore, artifact_list, tool-aware saves - #53
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Two-tier store: memory keeps everything for the session (unchanged behavior); a disk tier under a caller-chosen directory persists the subset approved by persistFilter(toolName) with an oldest-first byte budget, so tool history survives restarts — retrieved strictly on demand. ArtifactStore.save now requires the tool-aware signature (legacy 3-arg lives in a protocol extension forwarding dynamically); ContextManager passes the producing tool's name. artifact_list (new) enumerates both tiers for discovery and auto-registers when the store is listable. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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SAK half of the persistent-artifacts spec (Naseem repo: docs/superpowers/specs/2026-08-24-persistent-artifacts-design.md):
persistFilter(toolName)-approved subset (content-first, sidecar-last atomic writes; corrupt entries self-heal; oldest-first eviction overmaxBytes, default 25 MB).toolName:(protocol requirement for dynamic dispatch — a protocol-extension default was being selected over the actor's implementation, silently dropping the name; legacy 3-arg is the extension convenience). Only in-repo conformers existed.ContextManager.artifactToolswhen the store conforms toListableArtifactStore.Tests: 5 new (restart round-trip, filter, eviction, both-tier listing, ContextManager toolName pass-through); full suite 267/267.
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