Two release-tooling defects turned a pair of canary publishes into a broken
combination for consumers (a canary runtime resolving the last STABLE
channels-intelligence, which still called the removed `channel.addAdapter`).
1. Canary versions were prereleases of an ALREADY-PUBLISHED version. A stable
release leaves the working tree on the version it just published, and
computePrereleaseVersion appended `-canary.<id>` to exactly that, so the
canary sorted BELOW its own release (`0.2.1-canary.x < 0.2.1`): the `canary`
dist-tag pointed behind `latest`, and no dependent range could ever resolve
it. Base the canary on the next unreleased version instead (patch bump,
reusing computeNextStableVersion's prerelease rule).
2. A canary published one scope at a time, but the scopes are only independent
on the version axis. `@copilotkit/runtime` carries
`"@copilotkit/channels-intelligence": "workspace:*"`, and `pnpm pack`
resolves that against the working tree — so a `monorepo` canary pinned the
channels family to its last stable release even when the commit changed both
sides of the contract. Add a prerelease-only `all` selector that bumps and
publishes every scope from one commit under one shared canary id, and warn
loudly when a single-scope canary leaves a cross-scope pin behind.
`all` is a selector, never a scope: stable releases stay single-scope (their
tag, release branch, and npm/Slack links all derive from one scope name), which
publish-release.yml enforces in both jobs and the dropdown guard enforces per
workflow.