Skip rescript-schema-ppx and sury-ppx for unrelated sources

[cknitt]

Avoid running rescript-schema-ppx and sury-ppx on source files that do not contain an @schema annotation.

This extends rewatch’s existing source-triggered PPX filtering, avoiding unnecessary PPX invocations while preserving unconditional execution for unrelated PPXs.

Tests cover both PPX command names, sources with and without @schema, existing source-triggered PPXs, unconditional PPXs, and empty PPX command arrays.

[chatgpt-codex-connector]

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