fix(cli): complete version protocol follow-ups

[tkkhq]

Summary

Follow-up to #39 that completes the CLI-side version-protocol fixes:

• Report a neutral dev request version for source, dirty, and detached-revision builds while preserving the full build identifier in User-Agent and preserving release/nightly version forms.
• Render API instruction notices as soon as a log stream is established, before --follow blocks; consume the one-shot instruction so it is not printed again when command execution returns.
• Make the CLI wire-contract comment self-contained rather than referring to unavailable implementation details.
• Add coverage for stream request/response handling, no-latest deprecation notices, source-build version reporting, an actual /auth/* device-flow login, and sticky global-state cleanup.

Audience

• End users: notices remain visible for long-running log-follow sessions, and locally built binaries report an unambiguous development version.
• Contributors and self-builders: protocol behavior is covered through hermetic httptest cases, including source-build and login flows.

Test

• go build ./...
• go test ./... -count=1
• go test -race ./internal/api ./internal/cmd/upgrade ./internal/cmd/functions ./internal/cmd/frontends ./cmd/volcano -count=1

[Copilot]

Pull request overview

Completes CLI-side version protocol handling for development builds and long-running log streams.

Changes:

• Reports source builds as dev while preserving diagnostic User-Agent data.
• Displays and consumes API notices when log streams open.
• Expands protocol, login, stream, and state-cleanup tests.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/logfollow/follow.go	Adds stream-open callbacks.
internal/cmd/upgrade/upgrade.go	Consumes one-shot notices.
internal/cmd/upgrade/upgrade_test.go	Tests deprecation and cleanup.
internal/cmd/functions/logs.go	Prints notices before following logs.
internal/cmd/functions/logs_test.go	Tests runtime-follow notices.
internal/cmd/frontends/logs.go	Prints notices before following logs.
internal/cmd/frontends/logs_test.go	Tests runtime-follow notices.
internal/api/version_protocol.go	Adds consumption and development-version reporting.
internal/api/version_protocol_test.go	Tests version classification and consumption.
internal/api/log_stream_test.go	Tests stream protocol headers.
cmd/volcano/main_test.go	Expands end-to-end notice and login coverage.

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