ci: add rc prerelease workflow for next branch

ci: use OIDC trusted publisher instead of npm token

ci: add changesets release workflow

chore: mark adapter packages as private (unpublished)

chore: version packages (0.0.4)

feat: discover session key from any providerOptions namespace

chore: move runtime deps to peerDeps, pin dev versions to patch

feat: auto-route to v2 adapter when OPENCODE env is truthy

docs: add experimental warning, fix opencode npm entry to /v2

chore: add MIT license

chore: replace image and changelog paths in README on publish

chore: fix repository url format in package.json

chore: bump 0.0.2 for documentation

docs: add opencode usage guide, npm metadata, screenshot, and changelog link

docs: add opencode usage guide with screenshot and npm badges