SQLBI Whiteboard 0.9.5

Release 0.9.5 (#54)

Bumps `VersionPrefix` so the Store stage can be exercised with the
upload timeout fix
from #52.

A pipeline run uses the YAML on `main` as of that run, so #52 could not
be applied to
0.9.4 after the fact, and the Release stage refuses to reuse an existing
tag — which is
what the failed run after #52 merged was showing.

## No product change

Everything on `main` since `v0.9.4` is pipeline and documentation. The
binaries are
identical to 0.9.4; this release exists to put a version through the
Store stage.

## What the run should show

Two paths get their first real test, in this order:

1. **Clearing the abandoned submission.** The failed 0.9.4 attempt left
one in
`PendingCommit`. The stage deletes exactly that state and continues; any
other status
   still fails untouched.
2. **The upload.** With `--uploadTimeout` set, the blob client no longer
gets a zero
network timeout. Publish runs verbose, so a failure reports its own
exception instead
   of one swallowed line.

If it fails anyway, the GitHub release is already published by then and
every download is
unaffected — the stage runs after Release for exactly that reason.

## Verified locally

`dotnet build Whiteboard.sln -c Release` clean, no warnings; Core smoke
tests pass.