UploadShellService injected the concrete KeepaliveTransport class instead
of a token. The class was not exported, so a spec could not fake it, and
could not provide against the UploadTransport interface either, since an
interface is not a DI token. The port existed only on paper.
Add UPLOAD_TRANSPORT, an InjectionToken with a default factory that
resolves the same KeepaliveTransport singleton, following the
SessionPort/SESSION_PORT shape. UploadShellService now injects the token.
Runtime behaviour is unchanged.
Add upload-shell.service.spec.ts: a recording fake transport plus a fake
UploadAdapter exercise upload(), delete(), cancel() and pollReturning(),
the four methods the missing seam left unreachable. Coverage for
upload-shell.service.ts goes from 0% to 88.6% line / 85% branch.
Mark RB-25 done in 99-backlog.md and add its implementation note.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ehoandClaude Opus 5
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