Fix compute provisioning tests for the r3 runtime schema bump

[daniel-lxs]

What

develop is red: #301 bumped WORKER_RUNTIME_SCHEMA_VERSION 2→3, but its merge CI path-filtered away the apps/web test suite, so seven stale test expectations surfaced only when later merges (#291) touched apps/web and made CI actually run them.

No runtime bug — #301 never touched the provisioning currency logic; verified against its diff. This is test-only:

• "Current" fixtures use WORKER_RUNTIME_SCHEMA_VERSION / WORKER_RUNTIME_SCHEMA_TAG instead of hardcoded 2 / -r2, so future bumps don't break them
• The compute-providers derivation stubs now importOriginal, so fixtures and assertions exercise the real templateRef derivations instead of hand-rolled suffix-less strings
• Two tests that kept passing after the bump for the wrong reason (fixtures silently became "stale", flipping them onto untested paths) are re-anchored to the current version with strengthened assertions

Testing

• Full apps/web suite: 281 files / 1969 tests green (was 7 red on develop)
• check-types:fast, prettier clean

Unblocks develop and #305.

🤖 Generated with Claude Code

[roomote-roomote]

No code issues found. See task

This is a clean, test-only change. The "current" fixtures and assertions now derive templateRef from WORKER_RUNTIME_SCHEMA_TAG and WORKER_RUNTIME_SCHEMA_VERSION, and switching the @roomote/compute-providers mock to importOriginal correctly exercises the real deriveE2bWorkerTemplateRef / deriveDaytonaWorkerSnapshotName derivations (verified against packages/compute-providers/src/e2b/build-e2b-template.ts and .../daytona/register-daytona-snapshot.ts). Ran the three changed suites locally: 71 tests pass.

Note (non-blocking): the PR currently reports a merge conflict with develop — a rebase/merge will be needed before it can land.

_{Reviewed fa0cf4f}

[daniel-lxs]

Superseded: develop absorbed #304 (same test fix via the CI-failure automation) plus the #306/#307 provisioning rework while this was queued, and #310 handles the remaining duplicate-import typecheck error. Closing.