20.30.005 v2.1: official Path A slot; protect tp.idob, pack_ids, meaning fields

Author: CuriousOne23

thought_simulator/requirements_20/20.30.005_rtu_prim.md

@@ -1,5 +1,5 @@
 # **20.30.005 — RTU‑prm (Routing TP Update Primitive)**  
-**Version:** 2.0 (Modernized Option‑C Rewrite)  
+**Version:** 2.1 (IdOB neighbor hygiene + official Path A position)  
 **Status:** Normative — Pipeline A Routing‑Layer Primitive  
 **Purpose:** Construct deterministic routing_update metadata for TR‑prm and the scheduler.
 
@@ -20,9 +20,21 @@ RTU‑prm:
 - does **not** interpret meaning  
 - does **not** arbitrate lanes  
 - does **not** modify lineage  
+- does **not** invent `pack_ids[]`  
+- does **not** write `tp.idob` or `meaning_delta_h`
 
 RTU‑prm is a **pure routing‑signal constructor**.
 
+Official Path A inner stretch that includes RTU (informative; does not change RTU’s job):
+
+```
+WrdNm → ISc → RTU → TR → CTP → RB → IdOB → MCB → RBU
+```
+
+RTU sits **before** the RB commit that IdOB treats as a read-only routing view. Isolation fixtures may start at IdOB without a live RTU pass; that does not authorize RTU to interpret meaning when the lineup is live.
+
+IdOB may later **read** routing state as a view (20.40.050). RTU does not consume `tp.idob` to build `routing_update`.
+
 ---
 
 # **1. Scope (Normative)**
@@ -73,7 +85,10 @@ RTU‑prm SHALL NOT modify:
 - `TP.ssg_reason_code`  
 - `TP.ssg_status`  
 - `TP.presemantic_cues`  
-- `TP.tr_input_cues`
+- `TP.tr_input_cues`  
+- `tp.idob` / `TP.idob`  
+- `TP.semantic.meaning_delta_h`  
+- `pack_ids[]` / pack-load keys owned by COB / CEx / CIL  
 
 RTU‑prm produces routing_update **only**; it does not write to TP.
 
@@ -149,7 +164,7 @@ Fallback routing SHALL preserve safety by suppressing unsafe or undefined lanes.
 Routing confidence is a structural stability indicator:
 
 \[
-routing\_{confidence} = 1 - \frac{\text{num\_suppressed\_lanes}}{\text{total\_lanes}}
+routing_{confidence} = 1 - \frac{\text{num_suppressed_lanes}}{\text{total_lanes}}
 \]
 
 It is a heuristic, not a probability, and has no semantic or truth‑evaluation meaning.
@@ -178,5 +193,24 @@ RTU‑prm is defined in **20.30.005** and referenced by:
 - 20.30.020 — cycle allocation  
 - 20.30.030 — TCU budgeting  
 - 20.51 — RBU‑prm commit layer  
+- 20.15 — architecture scaffold (official Path A flow)  
+- 20.40.050 — IdOB‑prm (reads routing as a view after RB)  
+- 20.37 — TR‑prm (consumes routing_update; may read `TP.idob` when present)
+
+---
+
+# **11. IdOB / pack neighbor hygiene (Normative)**
+
+### **HLR‑20.30.005‑026 — Meaning-packet protection**  
+RTU‑prm SHALL NOT write `tp.idob`, `TP.idob`, `TP.semantic.meaning_delta_h`, `TP.semantic.meaning_semantics[]`, CIE rows, or six structure IDs.
+
+### **HLR‑20.30.005‑027 — Pack keys**  
+RTU‑prm SHALL NOT invent, load, or rewrite `pack_ids[]`. Pack keys are owned by the continuity / CEx-Pck contract (20.32 / 20.107.030 / 20.33). If `pack_ids[]` is present on the TP, RTU‑prm SHALL leave it unchanged.
+
+### **HLR‑20.30.005‑028 — Official Path A position**  
+On a live Path A cycle that includes identity-conditioned meaning, RTU‑prm SHALL occupy the slot after ISc and before TR in the stretch `WrdNm → ISc → RTU → TR → CTP → RB → IdOB`. RTU‑prm SHALL NOT be specified as running after IdOB on that stretch.
+
+### **HLR‑20.30.005‑029 — No IdOB interpretation**  
+RTU‑prm SHALL NOT read `tp.idob` as an input required to construct `routing_update`. IdOB may later read committed routing as a view (20.40.050); that read does not authorize RTU to score meaning axes, apply CIE, or expand residue into a next six-tuple.
 
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