Update PRD + PHASES.md — reflect 8-commit 2026-04-17 push
PRD status line: "Phases 0-18 shipped; hybrid operational; scheduled
ingest live; PDF OCR live; entering horizon items."
PHASES.md: federation L2 items marked complete, Phase 16.2 (autotune
agent), Phase 17 VRAM gate, MySQL connector, Phase 18 (hybrid Lance),
scheduled ingest, PDF OCR all documented with dates and measurements.
Stats updated: 52+ unit tests, 13 crates, 19 ADRs.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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