phase 3: playbook_lift harness reads judge from config

migrate the reality-test harness's judge-model default from a
hardcoded "qwen3.5:latest" string to cfg.Models.LocalJudge.

resolution priority: explicit -judge flag > $JUDGE_MODEL env >
cfg.Models.LocalJudge from lakehouse.toml > hardcoded fallback.

bumping the judge for run #N+1 now means editing one line in
lakehouse.toml [models].local_judge — no Go file or shell script
edits required.

changes:
- scripts/playbook_lift/main.go: -config flag added, judge default
  flips to "" so resolution chain runs. Imports internal/shared for
  config loader.
- scripts/playbook_lift.sh: JUDGE_MODEL no longer defaulted in bash;
  EFFECTIVE_JUDGE resolved by mirror-of-the-Go-chain (env > config
  grep > qwen3.5:latest fallback). Used for the Ollama presence
  check + report header. Pre-flight grep avoids requiring jq just
  to read the toml.
- reports/reality-tests/README.md: documents the 4-step priority
  chain.

verified all 4 paths produce the expected judge:
- config (no env): qwen3.5:latest (from lakehouse.toml)
- env override:    env wins
- flag override:   flag wins over env
- missing config:  DefaultConfig fallback still gives qwen3.5:latest

just verify PASS.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/playbook_lift.sh

@@ -29,11 +29,14 @@ cd "$(dirname "$0")/.."
 export PATH="$PATH:/usr/local/go/bin"
 
 RUN_ID="${RUN_ID:-001}"
-JUDGE_MODEL="${JUDGE_MODEL:-qwen3.5:latest}"
+# JUDGE_MODEL: empty means "let the Go driver resolve from
+# lakehouse.toml [models].local_judge". Set explicitly to override.
+JUDGE_MODEL="${JUDGE_MODEL:-}"
 WORKERS_LIMIT="${WORKERS_LIMIT:-5000}"
 QUERIES_FILE="${QUERIES_FILE:-tests/reality/playbook_lift_queries.txt}"
 CORPORA="${CORPORA:-workers,candidates}"
 K="${K:-10}"
+CONFIG_PATH="${CONFIG_PATH:-lakehouse.toml}"
 
 OUT_JSON="reports/reality-tests/playbook_lift_${RUN_ID}.json"
 OUT_MD="reports/reality-tests/playbook_lift_${RUN_ID}.md"
@@ -43,11 +46,20 @@ if ! curl -sS --max-time 3 http://localhost:11434/api/tags >/dev/null 2>&1; then
   exit 0
 fi
 
-if ! curl -sS http://localhost:11434/api/tags | jq -e --arg m "$JUDGE_MODEL" \
+# Resolve judge from config when not set explicitly — needed for the
+# Ollama model-presence check below. Mirrors the Go driver's priority.
+EFFECTIVE_JUDGE="$JUDGE_MODEL"
+if [ -z "$EFFECTIVE_JUDGE" ] && [ -f "$CONFIG_PATH" ]; then
+  EFFECTIVE_JUDGE="$(grep -E '^local_judge\s*=' "$CONFIG_PATH" | head -1 | sed -E 's/.*=\s*"([^"]+)".*/\1/')"
+fi
+EFFECTIVE_JUDGE="${EFFECTIVE_JUDGE:-qwen3.5:latest}"
+
+if ! curl -sS http://localhost:11434/api/tags | jq -e --arg m "$EFFECTIVE_JUDGE" \
     '.models[] | select(.name == $m)' >/dev/null 2>&1; then
-  echo "[lift] judge model '$JUDGE_MODEL' not loaded in Ollama — pull it first"
+  echo "[lift] judge model '$EFFECTIVE_JUDGE' not loaded in Ollama — pull it first"
   exit 1
 fi
+echo "[lift] judge resolved to: $EFFECTIVE_JUDGE (from ${JUDGE_MODEL:+env}${JUDGE_MODEL:-config})"
 
 echo "[lift] building binaries..."
 go build -o bin/ ./cmd/storaged ./cmd/embedd ./cmd/vectord ./cmd/matrixd ./cmd/gateway \
@@ -121,8 +133,12 @@ echo "[lift] ingest candidates..."
   | grep -v "^\[candidates\]\(matrix\|reality\)" || true
 
 echo
-echo "[lift] running driver — judge=$JUDGE_MODEL · queries=$QUERIES_FILE · k=$K"
+echo "[lift] running driver — judge=$EFFECTIVE_JUDGE · queries=$QUERIES_FILE · k=$K"
+# Pass empty -judge so the Go driver runs its config resolution chain
+# unless the operator explicitly set JUDGE_MODEL (in which case we
+# pass it through, taking priority over config).
 ./bin/playbook_lift \
+  -config  "$CONFIG_PATH" \
   -gateway "http://127.0.0.1:3110" \
   -ollama  "http://localhost:11434" \
   -queries "$QUERIES_FILE" \
@@ -148,7 +164,7 @@ generate_md() {
 # Playbook-Lift Reality Test — Run ${RUN_ID}
 
 **Generated:** ${gen_at}
-**Judge:** \`${JUDGE_MODEL}\` (Ollama)
+**Judge:** \`${EFFECTIVE_JUDGE}\` (Ollama, resolved from ${JUDGE_MODEL:+env JUDGE_MODEL}${JUDGE_MODEL:-config [models].local_judge})
 **Corpora:** \`${CORPORA}\`
 **Workers limit:** ${WORKERS_LIMIT}
 **Queries:** \`${QUERIES_FILE}\` (${total} executed)
@@ -211,6 +227,9 @@ MDEOF
 4. **Multi-corpus skew.** Default corpora=\`${CORPORA}\` — if all judge-best
    results land in one corpus, the matrix layer's purpose isn't being tested.
    Check per-corpus distribution in the JSON.
+5. **Judge resolution.** This run used \`${EFFECTIVE_JUDGE}\` from
+   ${JUDGE_MODEL:+env JUDGE_MODEL override}${JUDGE_MODEL:-the lakehouse.toml [models].local_judge tier}.
+   Bumping the judge for run #N+1 means editing one line in lakehouse.toml.
 
 ## Next moves