feat: add resource collector for Forgejo runners

Add Go application that collects CPU and RAM metrics from /proc filesystem:
- Parse /proc/[pid]/stat for CPU usage (user/system time)
- Parse /proc/[pid]/status for memory usage (RSS, VmSize, etc.)
- Aggregate metrics across all processes
- Output via structured logging (JSON/text)
- Continuous collection with configurable interval

Designed for monitoring pipeline runner resource utilization to enable
dynamic runner sizing.

scripts/hooks/pre-commit

@@ -0,0 +1,28 @@
+#!/bin/bash
+# ABOUTME: Pre-commit hook that runs formatting and linting checks.
+# ABOUTME: Install with `make install-hooks`.
+
+set -e
+
+echo "Running pre-commit checks..."
+
+# Run go fmt and check if there are any changes
+echo "Checking formatting..."
+UNFORMATTED=$(gofmt -l .)
+if [ -n "$UNFORMATTED" ]; then
+    echo "Error: The following files are not formatted:"
+    echo "$UNFORMATTED"
+    echo ""
+    echo "Run 'make fmt' to format them."
+    exit 1
+fi
+
+# Run linter
+echo "Running linter..."
+make lint
+
+# Check for secrets with gitleaks
+echo "Checking for secrets..."
+make gitleaks
+
+echo "Pre-commit checks passed!"