feat(framework): superpowers enforcement, typecheck hook, file-ownership rules (#451)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/mosaic/framework/tools/qa/typecheck-hook.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+# Lightweight PostToolUse typecheck hook for TypeScript files.
+# Runs tsc --noEmit on the nearest tsconfig after TS/TSX edits.
+# Returns non-zero with diagnostic output so the agent sees type errors immediately.
+# Location: ~/.config/mosaic/tools/qa/typecheck-hook.sh
+
+set -eo pipefail
+
+# Read JSON from stdin (Claude Code PostToolUse payload)
+JSON_INPUT=$(cat)
+
+# Extract file path
+if command -v jq &>/dev/null; then
+  FILE_PATH=$(echo "$JSON_INPUT" | jq -r '.tool_input.file_path // .tool_response.filePath // .file_path // empty' 2>/dev/null || echo "")
+else
+  FILE_PATH=$(echo "$JSON_INPUT" | grep -o '"file_path"[[:space:]]*:[[:space:]]*"[^"]*"' | sed 's/.*"\([^"]*\)"$/\1/' | head -1)
+fi
+
+# Only check TypeScript files
+if ! [[ "$FILE_PATH" =~ \.(ts|tsx)$ ]]; then
+  exit 0
+fi
+
+# Must be a real file
+if [ ! -f "$FILE_PATH" ]; then
+  exit 0
+fi
+
+# Find nearest tsconfig.json by walking up from the file
+DIR=$(dirname "$FILE_PATH")
+TSCONFIG=""
+while [ "$DIR" != "/" ] && [ "$DIR" != "." ]; do
+  if [ -f "$DIR/tsconfig.json" ]; then
+    TSCONFIG="$DIR/tsconfig.json"
+    break
+  fi
+  DIR=$(dirname "$DIR")
+done
+
+if [ -z "$TSCONFIG" ]; then
+  # No tsconfig found — skip silently
+  exit 0
+fi
+
+# Run tsc --noEmit from the tsconfig directory
+# Use --pretty for readable output, limit to 10 errors to keep output short
+TSCONFIG_DIR=$(dirname "$TSCONFIG")
+cd "$TSCONFIG_DIR"
+
+# Run typecheck — capture output and exit code
+OUTPUT=$(npx tsc --noEmit --pretty --maxNodeModuleJsDepth 0 2>&1) || STATUS=$?
+
+if [ "${STATUS:-0}" -ne 0 ]; then
+  # Filter output to only show errors related to the edited file (if possible)
+  BASENAME=$(basename "$FILE_PATH")
+  RELEVANT=$(echo "$OUTPUT" | grep -A2 "$BASENAME" 2>/dev/null || echo "$OUTPUT" | head -20)
+
+  echo "TypeScript type errors detected after editing $FILE_PATH:"
+  echo "$RELEVANT"
+  exit 1
+fi
+
+exit 0