chore: add pre-commit hook for golangci-lint

[alenkacz]

Summary

• Adds a pre-commit hook that runs golangci-lint on staged Go files before each commit
• Helps catch linting issues early, before they fail in CI
• Includes a simple setup script for contributors

Setup

./.githooks/setup.sh  # One-time after cloning

Test plan

Manually tested the hook:

1. No Go files staged - Hook passes immediately:

   🔍 Running pre-commit checks...
   No Go files staged for commit.
   ✅ Pre-commit checks PASSED
   

2. Go file with valid changes - Hook runs linter and passes:

   🔍 Running pre-commit checks...
   📝 Checking staged Go files...
   0 issues.
   ✅ All pre-commit checks PASSED
   

3. Missing golangci-lint - Hook provides installation instructions

4. Linting issues found - Hook blocks commit with helpful message:

   ❌ Pre-commit checks FAILED
   Commit blocked to maintain code quality.
   

🤖 Generated with Claude Code

[birdayz]

setup and hook need to use task cmds. global golangci-lint is a bad idea, because linting rules and behavior changes a lot between versions. taskfile pins versions and that matches the committed code.

[birdayz]

@alenkacz i updated this PR to have the taskw, what do you think? the setup is now clean and uses the existing tooling