feat(acb-evolver): add weekly automated map evolution ticker

Wire up the acb-map-evolver to run automatically on a weekly schedule
(Sunday 03:00 UTC by default) from the evolver deployment.

The map evolution ticker:
- Waits until the next scheduled time (weekday:hour:minute UTC)
- Runs acb-map-evolver --once to evolve maps for all player counts
- Repeats every 7 days

The schedule can be configured via ACB_MAP_EVOLUTION_SCHEDULE env var
(format: WEEKDAY:HH:MM, e.g., "0:03:00" for Sunday 03:00 UTC).

Enable via ACB_MAP_EVOLUTION_ENABLED=true or --enable-map-evolution flag.

Per plan §14.6: the weekly map evolution loads engagement scores,
runs MAP-Elites evolution, promotes high-scoring variants, and updates
the active map pool in the database.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.needle-predispatch-sha

@@ -1 +1 @@
-e1b21309cc6d91f6ccbfca96cdd965ab924a027f
+b31c306013e5d99cdf1224c14c7ff887139f187d

cmd/acb-evolver/Dockerfile

@@ -27,9 +27,15 @@ COPY bots/ ./bots/
 # Copy evolver source
 COPY cmd/acb-evolver/ ./cmd/acb-evolver/
 
-# Build the binary
+# Copy map evolver source
+COPY cmd/acb-map-evolver/ ./cmd/acb-map-evolver/
+
+# Build the evolver binary
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /acb-evolver ./cmd/acb-evolver
 
+# Build the map evolver binary
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /acb-map-evolver ./cmd/acb-map-evolver
+
 # Runtime stage — needs language runtimes for validation sandbox
 FROM golang:1.25-alpine
 
@@ -52,8 +58,9 @@ RUN apk --no-cache add \
 # Install TypeScript compiler globally
 RUN npm install -g typescript ts-node
 
-# Copy binary from builder
+# Copy binaries from builder
 COPY --from=builder /acb-evolver /app/acb-evolver
+COPY --from=builder /acb-map-evolver /app/acb-map-evolver
 
 # Create non-root user
 RUN addgroup -g 1000 acb && adduser -D -u 1000 -G acb acb

cmd/acb-evolver/run.go

@@ -906,15 +906,25 @@ func nextMapEvolutionTime(schedule WeeklySchedule) time.Time {
 // runMapEvolution executes the map evolution by running the acb-map-evolver binary
 // with the --once flag to trigger a single evolution run for all player counts.
 func runMapEvolution(ctx context.Context, db *sql.DB, verbose bool) error {
-	// Check if acb-map-evolver binary is available
-	cmd := exec.CommandContext(ctx, "acb-map-evolver", "--once")
-	cmd.Env = append(os.Environ(),
+	// Path to acb-map-evolver binary (built into same container)
+	const mapEvolverBin = "/app/acb-map-evolver"
+
+	// Verify binary exists
+	if _, err := os.Stat(mapEvolverBin); err != nil {
+		return fmt.Errorf("acb-map-evolver binary not found at %s: %w", mapEvolverBin, err)
+	}
+
+	// Prepare environment with database URL
+	cmdEnv := append(os.Environ(),
 		fmt.Sprintf("ACB_DATABASE_URL=%s", os.Getenv("ACB_DATABASE_URL")),
 	)
+
+	cmd := exec.CommandContext(ctx, mapEvolverBin, "--once")
+	cmd.Env = cmdEnv
 	if verbose {
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
-		log.Printf("map evolution: executing acb-map-evolver --once")
+		log.Printf("map evolution: executing %s --once", mapEvolverBin)
 	}
 
 	output, err := cmd.CombinedOutput()