chore: align repo scaffolding with the package standard

[TheGreatAxios]

Closes CL-9397

Summary

• LICENSE replaced with Interchange's text: line 162 had been edited to "version 2.1 of the License" and now reads "either version 2.1 of the License, or (at your option) any later version" like every other repo. CLA.md and the CLA Assistant workflow (cla.yml, signatures on a cla-signatures branch) added; CONTRIBUTING links the CLA.
• package.json: dropped main/types (exports covers Node and Bun), added keywords and homepage#readme, build clears dist first, test runs bun test src --pass-with-no-tests; key order is oxfmt's sortPackageJson order.
• tsconfig.json and tsconfig.build.json use the shared templates (the build config inherits types: ["bun"]).
• .gitignore replaced with the shared template.
• New ci.yml (the repo had no CI): Node 24, bun run check, then packs the tarball and imports createOllamaAdapter and createOllamaAnthropicAdapter under Node.
• CONTRIBUTING matches the template: the Packaging section (it restated package.json) is gone; the e2e instructions and "How it works" notes stay. New AGENTS.md.
• README gains a Quickstart that runs one turn through runInference with createOllamaAdapter against a local Ollama.
• CONTRIBUTING gets a Releasing section: releases are manual, as in Interchange (npm version, push tags, gh release create --generate-notes, npm publish).

Commits

1. chore: use the Interchange LICENSE text and add the CLA
2. build: align package.json and tsconfig with the package standard
3. ci: run check and a Node pack smoke
4. docs: trim CONTRIBUTING, add AGENTS.md and a README quickstart

Checks

bun run build, typecheck, lint, format:check, test and the Node pack-and-import smoke pass locally. test:e2e against a live Ollama server: 9 pass, 6 skip (models not pulled there). The Quickstart snippet typechecks and printed a reply against that server.