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Implements the three approved Phase 5 architecture decisions: 1. Zone embedding boundary: add explicit documentation in StateDimensions and StateEncoder._encode_zones making the 6144-dim zero-padded zone contract visible to future maintainers. 2. SQLite WAL online learning store: new OnlineLearningStore class backed by WAL-mode SQLite for concurrent read/write on single-machine baseline. New /api/policy/decide endpoint collects decisions during inference. Stats endpoint at /api/policy/decide/stats. 3. Forge-only default weights: change ppo_weight default from 0.5 to 0.0 across scope.py, DistillationConfig, DatasetConfig, and CLI defaults. Add MIXED_MODE_PRESETS dict with forge_only, forge_90_10, forge_80_20 presets. Distill/start endpoint now accepts a "preset" parameter. 27 new tests covering all three decisions (all passing). Co-authored-by: Claude <claude@anthropic.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>