V38 Gate 7: Harden ReadFitsFindingSynthesis search

Add source-safe depository search query plans, many-fit channel scoring, selected-fit provenance roots, and ReadFitsFindingSynthesis search receipts.

Generate and export the V38 search embeddings artifact, add checker and protocol tests, refresh prompt benchmark counts, and wire gate/canon workflows and documentation.

Proof: pnpm run check:v38-gate1..7, V38 spec quality, protocol tests, asset-pack typecheck, protocol typecheck, full asset-pack Jest, diff check, and staged secret scan.

Author: geraldarthurdavis

.bitcode/v38-prompt-benchmark-report.json

@@ -1699,8 +1699,8 @@
       "docCodeToolPromptCount": 0,
       "formatUsableToolsCount": 0,
       "readNeedComprehensionNamesCount": 0,
-      "readFitsFindingNamesCount": 8,
-      "depositorySearchToolNamesCount": 6,
+      "readFitsFindingNamesCount": 14,
+      "depositorySearchToolNamesCount": 7,
       "promptTemplateIdCount": 0,
       "benchmarkRunnerPromptPartMethodsCount": 0,
       "benchmarkRunnerPromptMethodsCount": 0,