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Guilhem LemouelandClaude Opus 5 6553dbee11 refactor: ask the instance what exists instead of remembering it

The wizard kept a note in `sessionStorage` — "this run created workspace X" —
so a reload could tell that a create had already happened. A note is a second
copy of a fact the instance already holds, and it could outlive the workspace
it named: the comment on `createdWorkspace` said a parked id might point at a
workspace someone else made at that id afterwards, and that there was no way to
tell, because a workspace carries no discriminator.

It carries `owner`. It is set to the creator's email at `INSERT INTO workspace`,
`listWorkspaces` already selects it, and the generated `Workspace` type already
has it. So the question the note was answering can simply be asked:
`probeWorkspace` returns whether a workspace with the plan's id exists among
the caller's, and whether they own it. Ownership is what makes adopting one
safe — an id that exists but belongs to someone else is not this run's work.

`parking.ts` and its test are gone. Nothing in the wizard writes storage now:
the plan is in the URL, what exists is in the instance, and what is in flight is
in memory, which is where in-flight things belong.

`probe.ts` also carries the two reads the follow-up needs — which of the paths
an import would write are already there, and whether a migration's tables exist.
The second is the ground truth for "did this migration run", covering both paths
`applyOneMigration` takes: it records a migration when the data table has them
enabled, and otherwise runs the SQL as a job nothing remembers. The tables
outlive both. It returns `undefined` rather than `false` when it cannot tell,
since "not there" invites a caller to run the migration and "cannot tell" does
not.

Verified against a real reload mid-run: the second attempt makes no
`createWorkspace` call, one `workspaces/list` call, and carries on to the fetch.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-24 11:23:40 +02:00