FTR-08 (File Naming, Track IDs & Versioning) already establishes a track-letter table for general multi-track document IDs — T Technical, C Construction, P Procurement, F Financial, O Operations, L Legal, B Business, R Relations/Stakeholder, M Marketing. FTR-28 and FTR-29 introduce two more, deliberately two-letter rather than single-letter to avoid colliding with that existing table: RS (Research Synthesis, general) and LR (Legal Research, casework-specific). These are a separate, parallel ID system for research-prompt-and-synthesis tracking specifically — not additions to FTR-08's own table. FTR-30 (Cascading Research Pipeline) extends the same RS/LR scheme with sub-IDs (RS[NN]-1, RS[NN]-2, ...) for a chain's individual steps — still the same two codes, not a third one. FTR-32 (Cowork Orchestrated Research) reuses the same RS/LR ID exactly as-is — it's a different execution mechanism for the same tracked item, not a fourth code. FTR-33 (Paste-Driven Provenance Archive) uses its own, separate citation/ID scheme per archive — it's not part of the RS/LR family at all, and doesn't need to be, since it isn't tied to FTR-28's engine.