Share prompt instructions and simplify validation helpers

docs/internal/validators.md

@@ -77,8 +77,10 @@ unavailable; production schema validation still rejects out-of-range confidence
 before reconciliation. A partially unavailable batch records one failed
 operation with only those requested indices, while a successful batch with
 ignored extras records a decision-filtering recovery. Fatal errors stop the
-chain without returning unchecked candidates as approved. Reconciliation makes
-no semantic retry or extra model call; guided recovery remains
+chain without returning unchecked candidates as approved. A local result builder
+retains already-collected decisions and operations on early returns; full
+cardinality checks and final sorting remain explicit on completed paths.
+Reconciliation makes no semantic retry or extra model call; guided recovery remains
 [deferred](../roadmap/future.md#domain-aware-response-recovery).
 
 Debug request metadata records `proposal_indices` in local-reference order
@@ -118,6 +120,10 @@ is covered by [report assembly](diagnostics-reporting.md).
 
 ## Supplemental Validation Context
 
+Request construction prepares one segment-position lookup and protected vocabulary
+for all candidates. Glossary selection remains candidate-specific, including the
+proposed replacement text.
+
 Each candidate includes the immediately preceding and following source segments
 available within its fixed chunk, labeled `preceding` or `following` with speaker,
 text, and categories, plus glossary entries whose names, aliases, or