Replace component reconciliation with a projectional core - #1807
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Replace the legacy reconciler with a semantic component document, reducers, and explicit source and runtime projectors. Coordinate reconciliation, policy caches, derived components, and undo/redo through reversible transactions. Cover text, embedded morphs, structural edits, layouts, masters, inheritance, and cross-module propagation. Add deterministic fuzzing, regression coverage, invariants, and performance benchmarks. Remove the legacy implementation, fallbacks, and stranded helper code, and rebuild the Flatn bundle.
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Summary
Why
The former reconciliation path had accumulated overlapping mutation logic and recurring edge-case failures. The new projectional core gives every direct manipulation an explicit semantic command and validates the projected source and runtime state at transaction boundaries.
Impact
Direct component manipulation now uses one projectional path with exact undo/redo and derived-component propagation. Rich-text attribute edits use a fast path, while embedded submorphs and structural changes remain transactionally synchronized with source.
Validation
./scripts/test.sh lively.ide lively.halos