Start resource cleanup after creation

[adamtheturtle]

Three Model Target public-interface tests initialized a resource ID to None before entering try/finally, so coverage needed no branch exclusions on the guarded cleanup.

Create and validate each resource first, then enter try/finally with a concrete string ID. Cleanup is now unconditional whenever a resource exists, the optional-state bookkeeping disappears, and all three coverage pragmas are removed.

Validation:

• focused public-interface cases: 8 passed, 4 real-backend cases skipped locally
• all configured pre-commit, pre-push, and manual hooks
• full non-real suite: 1,957 passed, 833 skipped
• the changed test paths are covered locally; the repository-wide 100% gate requires the configured hosted real/skip/Windows coverage partitions

[adamtheturtle]

The exact-head Test rerun is terminal. The changed Model Target Web API module passed, as did Combine & check coverage at 100%. The only root failures are the same real-Vuforia TestSuccess and TestIncludeTargetData ProjectSuspended cases present on current main; completion-ci is their aggregate.