Initial design docs for RECON pipeline refactor

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

phases/README.md

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+# Phases
+
+Per-phase execution documents live here. Each phase gets its own markdown file with detailed steps, commands, verification criteria, and rollback procedures.
+
+Phase documents are written just-in-time — the details of phase 3 are informed by what we learn in phases 1 and 2. Writing all six up front would be speculative and would churn as reality hits.
+
+## Naming convention
+
+- `phase-0-baseline.md` — baseline capture
+- `phase-1-scaffolding.md` — new directories and config
+- `phase-2-shared-filing.md` — shared filing function
+- `phase-3-transcript-processor.md` — first processor end-to-end
+- `phase-4-pdf-processor.md` — second processor
+- `phase-5-cutover.md` — service cutover and transcript resweep
+- `phase-6-cleanup.md` — dead code removal and docs
+
+## Status
+
+None of the per-phase docs exist yet. They will be added as each phase is scoped.
+
+The high-level plan lives in `../migration-plan.md`.