#30: per-session folder layout + README + sessions.json
Restructures the flat repo into one folder per session, with a top-level README.md (the "about sessions" page, also rendered at /docs/sessions/about by rfc-app v0.19.0+) and a sessions.json title manifest keyed by 4-digit NNNN. Filenames inside each folder retain the full SESSION-NNNN.M-TRANSCRIPT-… form (no trim of the SESSION- prefix). Legacy letter-form transcripts, if any are still at the root, are not moved — the folder convention applies to the numeric form only. Session 0017.0; see SESSION-PROTOCOL.md §1 amendment for the binding shape.
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