docs: update README examples to use find command

[galligan]

Summary

Root README uses deprecated blz get and blz search commands in examples.

Findings

Issue ID	Description
README-001	Uses deprecated blz get and blz search in examples

Current Examples (deprecated)

```bash
blz search "useEffect cleanup"
blz get react:41994-42009
```

Should Be

```bash
blz find "useEffect cleanup"
blz find react:41994-42009
```

Files to Update

• README.md - Update all command examples to use find

Priority

High - README is first impression for users.

[linear]

BLZ-317