Dedup MIN_SHARE_OF_SPEND: boundary-classify imports it from ia_store

bin/boundary-classify defined its own copy of the spec §5.2.7 filing
threshold that only happened to match ia_store.py's copy, which
bin/stability-classify's FR-4.5 stability gate actually reads. Tuning
either constant independently would silently desynchronize the gate
from the classifier it's meant to gate. ia_store.py is now the single
definition; boundary-classify imports it.

MIN_INVOCATIONS/MIN_ATTRIBUTED_TURNS are left as-is: stability-classify
does not import or use them, so their duplication doesn't create the
same fail-silently risk. Centralizing all thresholds via
references/signals-catalog.md remains a separate, larger follow-up per
the issue's "Related / proper fix" note.

Fixes kotkan/claude-plugin-inference-arbitrage#14

.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"

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

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