Follow a renamed notebook, and case session names as the product is written

[jgfoster]

Follows #7. Three changes, one of which turned out to be a real bug rather than a cosmetic one.

Renaming a notebook was losing its session and its variables

A notebook's URI is both its session key and its namespace key. So renaming the file did two things nobody wanted: the old session stayed in the map — logged in, spending one of ten, owned by a URI nothing would ever ask for again — and the notebook started over with an empty namespace, which reads as my variables disappeared.

renameOwner moves the scope entry inside the session, re-keys the map, and re-publishes the cache name (a stale one points an administrator at a file that is not there). Wired to onDidRenameFiles, which is explicit renames only — saving under a new name makes a second document and correctly gets a session of its own.

The names

Owner	Was	Now
Notebook	gemdb nb analysis	GemDB nb analysis
Shell	gemdb sh 41234	GemDB Shell 41234
Extension's own	gemdb ext	GemDB Code
Script run	gemdb run backfill	GemDB run backfill

Shell spelled out, nb not, and the asymmetry is deliberate: a shell's suffix is a fixed-width pid, so the longer tag costs nothing, while a notebook's suffix is a filename and every character the tag takes is one the title loses — 22 against 16 if it were GemDB notebook . Ordinary notebook names exceed 16.

On capitalisation

CLAUDE.md already answers most of it: write "GemDB Shell" wherever a user can see it, and an administrator reading a session list is a user. So product names are capitalised as the product is written and common nouns (nb, run) are not — which is just English, and happens to make the rows self-describing.

It also fits the column. GemStone's own names there are PascalCase: GcReclaim, SymbolGem, ShrPcMonitor, TopazL, and — newly measured for this PR — TopazR, the default for an unnamed RPC gem, which is precisely what a GemDB session would otherwise show as. The one lowercase entry is the stone's own slot, and that carries the stone's configured name rather than a product's, so it isn't a counter-example. An all-lowercase gemdb nb … would have been the only thing of its kind in the list.

The notebook's own title is left exactly as the user wrote it — the tag is ours to style, the filename is theirs, and re-casing it would make the label harder to match against the file in the explorer.

Verification

• 109 unit tests, including that a notebook's capitalisation survives untouched.
• 46 integration tests. The new one renames a notebook that has a session and a variable, then checks all four things that could go wrong: the session count did not grow, the sessionId is the same one, the variable survived the move, and the shared cache reports the new name.
• Lint, format, both typechecks clean.

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