Complete documentation rebuild

docs/internal/README.md

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+# Internal Documentation Index
+
+## Audience
+Developers and LLM coding agents changing Narratio internals.
+
+## Scope
+Implementation-accurate contracts for workspace/state, stages, and external adapter boundaries.
+
+## Component Docs
+- `workspace.md`: local state model, manifests, run-local layout, promotion, and cleanup invariants.
+- `stage-prepare.md`: input materialization and provenance capture.
+- `stage-transcribe.md`: WhisperX transcript generation.
+- `stage-merge.md`: Seriatim normalization + merge.
+- `stage-polish.md`: Audita transcript polishing.
+- `stage-normalize.md`: post-polish normalization.
+- `stage-trim.md`: bounds-driven transcript trimming.
+- `stage-analyze.md`: Scriptorium session recap generation.
+- `stage-archive.md`: archive upload and current-pointer publish contract.
+- `integration-audita.md`: Audita adapter invocation/validation contract.
+- `integration-seriatim.md`: Seriatim merge/normalize/trim adapter contract.
+- `integration-scriptorium.md`: Scriptorium run/render adapter contract.
+
+## Canonical Owner
+`docs/internal/` is the canonical home for implemented internals per `docs/documentation/policy.md`.