Fix runtime dependency parity data targets

[chubes4]

Summary

• Count preserved runtime island data attributes as generated parity targets.
• Avoid classifying ordinary drum-machine scripts as RUM telemetry.
• Add contract coverage for preserved data-attribute targets and shared drum scripts whose selectors belong to another page.

Verification

• Local fixture repro: 48-desktop-os-sim and 68-drum-machine both pass runtime dependency parity with 0 findings.
• php php-transformer/tests/contract/run.php
• php php-transformer/tests/parity/run.php
• git diff --check

AI assistance

• AI assistance: Yes
• Tool(s): GPT-5.5 via OpenCode
• Used for: Diagnosed fixture parity failures, implemented the PHP parity fix, added regression coverage, and ran local verification.