tooling: beagle-callgraph RENTS chartroom callgraph.clj; delete the duplicated engine

The scope-correct call-graph engine was copy-pasted in beagle/bin/_beagle-callgraph.clj
AND chartroom. It now lives once in chartroom/src/callgraph.clj; beagle rents it:

- bin/beagle-callgraph: exec bb -cp $FRAM_OUT:$CHARTROOM/src -m callgraph (CHARTROOM env,
  defaults ~/code/chartroom; fails closed if the engine is missing).
- DELETE bin/_beagle-callgraph.clj (the duplicate).
- CI: the cascade-graph gate passes CHARTROOM=$GITHUB_WORKSPACE/.chartroom (already checked out).

The code-as-claims engine (Layer 2) lives in chartroom; beagle/bin tooling is Layer-3
consumer glue that rents it. Verified: cascade-graph gate green renting the engine
(incl. a relocated CHARTROOM; bogus CHARTROOM fails fast).

Author: tompassarelli

.github/workflows/test.yml

@@ -69,8 +69,11 @@ jobs:
           repository: tompassarelli/chartroom
           path: .chartroom
 
+      # beagle-callgraph RENTS chartroom's scope-correct call-graph engine
+      # (src/callgraph.clj) — the Layer-2 engine lives in chartroom, beagle's tooling
+      # rents it, so CHARTROOM must point at the checked-out copy.
       - name: Graph-native cascade — scope-correctness gate
-        run: FRAM_OUT="$GITHUB_WORKSPACE/.fram/out" bin/test/cascade-graph/run.sh
+        run: FRAM_OUT="$GITHUB_WORKSPACE/.fram/out" CHARTROOM="$GITHUB_WORKSPACE/.chartroom" bin/test/cascade-graph/run.sh
 
       # Repair pipeline: beagle-repair consumes blame.rkt's semantic suspicions as
       # STRUCTURED records, not by regex-scraping the prose SUSPECT line. Gates that

bin/_beagle-callgraph.clj

@@ -25,15 +25,23 @@ fi
 DIR="$(cd "$1" && pwd)"
 BIN="$(cd "$(dirname "$0")" && pwd)"
 FRAM_OUT="${FRAM_OUT:-$HOME/code/fram/out}"
+# The scope-correct call-graph ENGINE is Layer 2 and lives in chartroom (callgraph.clj);
+# beagle's tooling RENTS it — one engine, no duplicated copy. Override with CHARTROOM.
+CHARTROOM="${CHARTROOM:-$HOME/code/chartroom}"
 
 if [[ ! -d "$FRAM_OUT" ]]; then
     echo "beagle-callgraph: Fram classpath not found at $FRAM_OUT" >&2
     echo "  (graph-native repair runs on the Fram engine — build fram/out or set FRAM_OUT)" >&2
     exit 3
 fi
+if [[ ! -f "$CHARTROOM/src/callgraph.clj" ]]; then
+    echo "beagle-callgraph: Layer-2 call-graph engine not found at $CHARTROOM/src/callgraph.clj" >&2
+    echo "  (the engine lives in chartroom; check it out or set CHARTROOM)" >&2
+    exit 3
+fi
 
 CLAIMS="$(mktemp /tmp/beagle-callgraph.XXXXXX)"
 trap 'rm -f "$CLAIMS"' EXIT
 
 "$BIN/beagle-claims" "$DIR" > "$CLAIMS"
-exec bb -cp "$FRAM_OUT" "$BIN/_beagle-callgraph.clj" "$CLAIMS"
+exec bb -cp "$FRAM_OUT:$CHARTROOM/src" -m callgraph "$CLAIMS"