add pre-commit hooks, move claude to agents. (#2877)

.golangci-lint-hook.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Wrapper script for golangci-lint pre-commit hook
+# Finds where the current branch diverged from the main branch
+
+set -euo pipefail
+
+# Try to find the main branch reference in order of preference:
+# 1. upstream/main (common in forks)
+# 2. origin/main (common in direct clones)
+# 3. main (local branch)
+for ref in upstream/main origin/main main; do
+    if git rev-parse --verify "$ref" >/dev/null 2>&1; then
+        MAIN_REF="$ref"
+        break
+    fi
+done
+
+# If we couldn't find any main branch, just check the last commit
+if [ -z "${MAIN_REF:-}" ]; then
+    MAIN_REF="HEAD~1"
+fi
+
+# Find where current branch diverged from main
+MERGE_BASE=$(git merge-base HEAD "$MAIN_REF" 2>/dev/null || echo "HEAD~1")
+
+# Run golangci-lint only on changes since branch point
+exec golangci-lint run --new-from-rev="$MERGE_BASE" --timeout=5m --fix