gentle-pi v0.9.2

fix(sdd): resolve status from engram for non-openspec artifact stores

The native SDD status engine was OpenSpec-only and froze engram-backed sessions (and both sessions without materialized openspec files) with a false "No active SDD changes found" block. The engine is now scoped by artifact store: engram / none / both-without-disk route through a single non-authoritative status (resolve readiness from Engram); openspec stays authoritative. The chosen store is threaded from preflight and persisted durably so a cache miss can't revert to openspec. Validated across 5 rounds of dual adversarial review.