Apply standard Go formatting and update project documentation

- Run go fmt on all Go files to ensure consistent formatting
- Add official Go tooling commands to CLAUDE.md for code quality
- Update project status to reflect current implementation state

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a CLI tool called "collect" that recursively collects files matching specific criteria, maintains their file structure, and archives them for backup purposes.
+
+## Project Status
+
+The collect CLI tool has been implemented with the following features:
+- Multiple `--name` flags for exact filename matching
+- Multiple `--match` flags for directory pattern matching
+- Support for combining `--name` and `--match` flags with OR logic
+- Preserving original directory structure in the output
+- Creating archives in tar.gz or zip format
+
+## Implementation Notes
+
+The tool accepts:
+1. Multiple `--name` and `--match` flags in any combination
+2. Two positional arguments: source directory and output archive path
+3. Archive format determined by output file extension (.tgz/.tar.gz or .zip)
+4. Recursive directory traversal while preserving original structure
+
+## Code Quality
+
+Before committing changes, run these official Go tools:
+- `go fmt ./...` - Format all Go files to standard style
+- `go vet ./...` - Check for common mistakes and suspicious code
+- `go test ./...` - Run unit tests (when available)
+- `./test.sh` - Run integration tests