Set up project scaffold: Bun/OpenCode plugin with registry pattern

- AGENTS.md adapted from taskgraph for this Bun/TypeScript plugin
- Dual MIT/Apache-2.0 licenses
- Package.json, tsconfig, biome config following open-memory pattern
- Skeleton src/ with registry-pattern tasks tool (help operation working)
- Opencode.json plugin config
- .gitignore for dist, node_modules, lockb
- Remove typo .gitingore files, proper .gitignore in .opencode/

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 work by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.