diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index 59c80c1..9428698 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
 	"name": "inference-arbitrage",
-	"version": "0.6.0",
+	"version": "0.6.1",
 	"description": "Audits a Claude Code plugin's definitions and usage transcripts to find steps that should be a deterministic script instead of raw LLM inference, and files the well-evidenced ones as issues on the target repo.",
 	"author": {
 		"name": "oleks"
diff --git a/bin/boundary-classify b/bin/boundary-classify
index 1b0d743..ee6b3d5 100755
--- a/bin/boundary-classify
+++ b/bin/boundary-classify
@@ -13,14 +13,18 @@ import argparse
 import json
 import sys
 
+from ia_store import MIN_SHARE_OF_SPEND
+
 RUBRIC_VERSION = "1.0.0"
 
 OFFLOADABLE_POSITIONS = {"pure-script", "llm-over-script-digest"}
 POSITIONS = OFFLOADABLE_POSITIONS | {"script-with-compiled-judgment", "pure-inference"}
 TESTS = ("T1", "T2", "T3", "T4", "T5")
 
-# spec §5.2.7 filing threshold
-MIN_SHARE_OF_SPEND = 0.02
+# spec §5.2.7 filing threshold — single definition lives in ia_store.py
+# (kotkan/claude-plugin-inference-arbitrage#14); FR-4.5's stability gate
+# (bin/stability-classify) imports the same constant, so tuning it here
+# can no longer desynchronize the gate.
 # Below these, the dynamic pass is too thin to carry the share-of-spend gate on
 # its own. Derived from the Phase 3 finding that a skill invoked once inside a
 # multi-topic session produces a share that is arithmetically real but not
diff --git a/bin/ia_store.py b/bin/ia_store.py
index 735e4a5..8dd0e4a 100644
--- a/bin/ia_store.py
+++ b/bin/ia_store.py
@@ -20,10 +20,11 @@ import sys
 
 DEFAULT_STORE = "~/.cache/inference-arbitrage/wiki"
 
-# spec §5.2.7's filing threshold, mirroring bin/boundary-classify — a candidate
-# must clear the same bar to be called fixed, or stable, that it had to clear to
-# be filed. Changing one without the others would make those words mean
-# something the filing gate never meant.
+# spec §5.2.7's filing threshold — single definition (kotkan/claude-plugin-
+# inference-arbitrage#14). bin/boundary-classify imports this rather than
+# keeping its own copy, so a candidate must clear the same bar to be called
+# fixed, or stable, that it had to clear to be filed. Changing it here changes
+# it everywhere; the two can no longer drift apart silently.
 MIN_SHARE_OF_SPEND = 0.02
 MIN_INVOCATIONS = 3