调研(08-11-internal-oa-usage-census-and-simplification): 固化采用度普查与减法决策

.trellis/spec/hyb-oa/project-governance.md

@@ -76,6 +76,38 @@ otherwise -> defer, hide, freeze or keep as a manual SOP
 **Related**: the evidence-backed baseline and initial retirement candidates are
 recorded in task `07-26-small-team-internal-oa-review`.
 
+### Design Decision: Adoption Mode Before Product Expansion
+
+**Context**: the 2026-08-11 production read-only census found extremely low
+team adoption across the system. This does not prove that missing features are
+the cause; several workflows intentionally live in Enterprise WeChat or manual
+processes.
+
+**Decision**: management must choose one operating mode before any new product
+feature task starts:
+
+1. **Enforced use**: designate a real near-term workflow, require the team to
+   complete it in OA, and use observed blockers—not guessed needs—as product
+   input.
+2. **Ledger fallback**: keep OA as a low-frequency record, control and recovery
+   system; reduce navigation and maintenance surface instead of expanding it.
+
+Until the mode is recorded in the business fact source, freeze new product
+features. Real production defects and the security/recovery baseline remain
+eligible. Reversible navigation reduction is valid under either mode, but it
+still requires its own Trellis task and approval for production configuration
+writes. Do not create that follow-up task as a side effect of a census or review
+task.
+
+```text
+adoption mode undecided -> no new product feature task
+mode A + observed team blocker -> consider one small product task
+mode B -> prefer hide, freeze, retire review, manual SOP or necessary upkeep
+```
+
+**Related**: task `08-11-internal-oa-usage-census-and-simplification` contains
+the evidence boundary and module decision matrix.
+
 ## Stop Conditions
 
 - Production config, deployment, database reset, migration drift, real data