Dual license MIT OR Apache-2.0, add publish config, track bun.lock

- Add LICENSE, LICENSE-MIT, LICENSE-APACHE for dual licensing
- Add files + publishConfig.access to package.json for npm publish
- Update license references in AGENTS.md and README
- Fix .gitignore: track bun.lock, ignore bun.lockb instead of *.lock
- Track bun.lock in git

LICENSE

@@ -0,0 +1,10 @@
+Dual licensed under:
+
+- MIT License (<LICENSE-MIT>)
+- Apache License, Version 2.0 (<LICENSE-APACHE>)
+
+at your option.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.