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feat(rendering): slice 12 — Stage 2 shadow mode behind AGENT_CODE_RENDER_SHADOW - #439
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Juliusolsson05 merged 1 commit intoJul 6, 2026
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…DER_SHADOW shadowDiff.ts normalizes both renderers to the coarsest grain they share (committed/optimistic/ghost rows by stable id, semantic turns by turnId, work/empty flags) so representation differences — block-level vs turn-level, plane prefixes vs folded uuids — never read as divergence, while real ones (missing/extra/mis-ordered rows) always do. Set difference before order comparison so one missing row is one finding, not a cascade of order mismatches. useRenderShadow mounts in TileLeaf (the one component holding the full runtime): probes the flag once app-wide via the existing dev-debug config channel, recomputes the legacy model from the same pure functions Feed uses, runs the adapter+ledger per-session (refs, so the D11 caches are actually exercised on real ticks), and records divergences to a ring buffer on globalThis.__agentCodeRenderShadow + console.warn once per signature. Zero cost when the flag is off; DELETE-fated at Stage 3. 72 pipeline tests. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Stage 2 opens: the new pipeline now runs beside the legacy renderer on real sessions when
AGENT_CODE_RENDER_SHADOW=1.shadow/shadowDiff.ts— normalizes both renderers to the coarsest shared grain (rows by stable id, semantic turns by turnId, work/empty flags). Representation differences (block-level vs turn-level, plane prefixes vs ghost-folded uuids) never read as divergence; real ones (missing / extra / mis-ordered rows) always do. Set difference before order comparison — one missing row is one finding, not an order-mismatch cascade.shadow/useRenderShadow.ts— mounted in TileLeaf (the one component holding the fullSessionRuntime). Probes the flag once app-wide, recomputes the legacy comparable from the same pure functions Feed uses (flag-gated, zero prod cost), runs adapter+ledger per session via refs so the D11 identity caches are exercised on real ticks, and records divergences toglobalThis.__agentCodeRenderShadow(ring of 50, each report a fixture seed) + oneconsole.warnper divergence signature.renderShadowEnabledrides the existingdev-debug:get-configchannel (no channel proliferation); flag + shadow + diff are all DELETE-fated at Stage 3 cutover together.Next: run real sessions with the flag on across all three providers; every untriaged divergence class becomes a fixture per the plan's Stage 2 exit criterion.
72 pipeline tests; tsc gate (node + web) clean.
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