/migrate

Convert existing .env file to .env.op format with 1Password references

# Migrate .env to 1Password References

Convert an existing `.env` file to `.env.op` format, replacing secret values with `op://` references.

## Phase 1: Locate and Read .env File

1. **Find the .env file**:
   - Use `$ARGUMENTS` if provided (e.g., `.env.local`)
   - Default to `.env` in current directory
   - Search for common variants: `.env`, `.env.local`, `.env.development`

2. **Read and parse the file**:
   - Extract all `KEY=value` pairs
   - Identify which values look like secrets vs. static config
   - Preserve comments and structure

## Phase 2: Classify Variables

Categorize eac...