refactor(schema): rename commission_certified to commission_certifiable

The flag is a susceptibility marker, not an absolute state — Commission
certification only applies when trading in TRACTUS_PRIMARY zones.
Compact-internal trade ignores it entirely. Renamed across all TOML
source files, schema docs, workshop outputs, and D-184.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

decisions/economics.md

@@ -238,7 +238,7 @@ This domain covers: currency system, commodity taxonomy, shadow economy, corpora
   - **3 luxury services** — tourism, entertainment/holo-content, fine dining/hospitality; location-bound
   - **Source of truth:** `wiki/economics/commodities.toml` and `wiki/economics/production_chains.toml`
   - 21 production chains including 2 substitution routes
-  - Schema: 14 fields per commodity including 3 political sub-flags (`commission_certified`, `compact_contested`, `shadow_viable`), `production_ubiquity`, `demand_model`, `panic_threshold_weeks`
+  - Schema: 14 fields per commodity including 3 political sub-flags (`commission_certifiable`, `compact_contested`, `shadow_viable`), `production_ubiquity`, `demand_model`, `panic_threshold_weeks`
 - **Rationale:** The catalog is the concrete realization of the D-173 taxonomy. 36 types is rich enough to produce meaningful geographic specialization while remaining authorable. The 14-field schema captures economic, political, and behavioral properties needed by the tâtonnement simulation. Two substitution routes prevent hard lock-outs in chains where one raw source is geographically constrained.
 - **Raised by:** Full planning team, Sprint 32 Workshop #801.
 - **Dissent:** None.