Decode SCINIT scene dispatch registry

docs/vm-mapping-plan.md

@@ -53,11 +53,12 @@
 
 - [x] **2.0 — Project structure.** Established `docs/`, `build/{disasm,text,data,scripts-json}/`, `godot/`; game install stays read-only in place. Also relaxed the loader magic check to the `SYS4` family (`SYS4424` patch scripts now parse — was silently skipping 5 scripts).
 - [x] **2.1 — Text corpora.** `tools/extract_phase2.py` → 481/481 scripts: full disassembly (`build/disasm/*.asm`), per-script strings, `build/text/dialogue.jsonl` (**30,057 show-text lines** — the translation corpus), `build/text/strings.jsonl` (38,449 strings tagged by source opcode), `build/manifest.json`.
-- [x] **2.2 — `*INIT` data and rule sources → JSON.** `tools/extract_init.py` auto-detects shape (`name`/`numeric`/`footer`/`mixed`/`rules`) → **SKINIT (131 skills), ITINIT (287 items), EBINIT (277 units), OBINIT (46 object definitions)** [name: sparse one-based name/description/fields], **CGINIT (379 CG entries)** [numeric: index-keyed columns], **MPINIT (1472 map records)** [footer: length-prefixed arrays], **STINIT (74 stages)** [mixed: selector-dispatched strings/scalars/buffer cells/footer arrays], and **CCINIT (71 class-change rules over 33 units)** [rules: unit/level/state predicates plus title/cost/stat/skill effects]. Validated; see `build/data/README.md`. Raw addresses remain bytecode provenance; confirmed semantics come from `vm-map/globals.toml`.
+- [x] **2.2 — `*INIT` data and rule sources → JSON.** `tools/extract_init.py` auto-detects shape (`name`/`numeric`/`footer`/`mixed`/`rules`/`dispatch`) → **SKINIT (131 skills), ITINIT (287 items), EBINIT (277 units), OBINIT (46 object definitions)** [name: sparse one-based name/description/fields], **CGINIT (379 CG entries)** [numeric: index-keyed columns], **MPINIT (1472 map records)** [footer: length-prefixed arrays], **STINIT (74 stages)** [mixed: selector-dispatched strings/scalars/buffer cells/footer arrays], **CCINIT (71 class-change rules over 33 units)** [rules: unit/level/state predicates plus title/cost/stat/skill effects], and **SCINIT (1,209 final decision rows)** [dispatch: scene resource plus authored chapter metadata and overwrite history]. Validated; see `build/data/README.md`. Raw addresses remain bytecode provenance; confirmed semantics come from `vm-map/globals.toml`.
 - [x] **2.3 — Extract `STINIT`'s 74 sparse stage records.** The mixed mode identifies the dominant `scjump_progress_a` dispatch, recovers 29 preallocated buffer layouts (including six consumer-confirmed row strides), and keeps four condition strings, six scalars, fixed-buffer writes, and all 1,396 footer-array copies separated by stage id. Profiles supply population/value and direct-consumer evidence. Header/map semantics cover conditions, BGM, turn/replay/clear-reward settings, and map texture overrides. The object join assembles 2,312 placements with type/position/gates, OBINIT names and available descriptions, 604 reinforcement schedules, and typed initial-faction, teleport, treasure, card-list, non-triggering-faction, and initial-object-state payloads; FIELD's dedicated special-spawn path proves the final three populated type-27 tagged writes are engine-dead, so they remain visible as ignored provenance rather than unresolved semantics. The 30-cell enemy family contributes 1,378 joined spawns with unit/faction, placement, difficulty/story gates, level scaling, weighted selection, difficulty-specific movement/battle routine sets, and 485 first-clear-only gates. Raw address views remain alongside generated `semantic_fields`.
 - [x] **2.3a — Extract `CCINIT`'s 71 class-change rules.** Rules mode preserves source-order guards and detects the unit id, minimum level, clear applied-state slot, selected title/level, deployment-cost delta, named fourteen-stat bonuses, awarded SKINIT skills, and state slot set by each rule. EBINIT/SKINIT definition joins and the common global semantic projection coexist with raw addresses. CALCCC/ADDEXP establish the apply/report ABI; EVOLVE explains the two level-independent empty-title Lily rules. The generated profile covers 33 units, 69 titled rules, 30 skill awards, three used promotion slots, and 19 populated output fields.
+- [x] **2.3b — Extract `SCINIT`'s scene-dispatch registry.** Dispatch mode recognizes 2,179 alternating writes to two 10,000-cell arrays, preserves all 710 overwritten decision ids, and emits 1,209 final rows. The primary column maps decisions to 135 packed SYS4INI ids, all resolved to numbered SC scripts; the parallel column is authored chapter metadata. All 847 live SCJUMP decisions join to rows and 844 final chapter tags agree with the independently decoded paths; three legacy/stale mismatches remain explicit.
 - [x] **2.4 — Partial global-var map BUILT + wired into the disassembler.** `tools/global_map.py` → `build/global-var-map.{json,md}` (16,354/49,435 globals labelled: string tables, `*INIT` field arrays, 122 record tables w/ strides, current-entity index pointers). `sys4load` renders the labels inline (`=rec[s30]`, `=current-entity-index?`). See `docs/name-resolution.md`.
-- [ ] **2.5 — Grow the global-var map (future, incremental).** Static first: fold in `*MES` writers; label 2D record tables by their reader scripts. Then Frida to name *which stat* each field is. Full detail: `docs/name-resolution.md` → "Future step — growing the map". Also deferred: `call-script` id→name resolution (engine-level — SCJUMP.BIN decode or Frida; see `docs/name-resolution.md` #1).
+- [ ] **2.5 — Grow the global-var map (future, incremental).** Static first: segment RTINIT's sparse multi-table banks, fold in remaining `*MES` writers, and label 2D record tables by their reader scripts. Then Frida to name *which stat* each unresolved field is. Full detail: `docs/name-resolution.md` → "Future step — growing the map". Packed `call-script` ids and SCJUMP decision-to-scene dispatch are resolved; see `docs/name-resolution.md` #1 and `docs/scjump-progression.md`.
 
 ## Phase 3 — Name the unnamed opcodes *(top ~20 BEFORE Phase 4; the rest on demand)*