Content rewriting trait (or verification) #489

Description

Evaluate whether content rewriting (HTML injection, attribute rewriting, compression) needs a platform trait or is already platform-agnostic. Document outcome.

Done when

• Platform-specific or agnostic outcome documented
• Per-PR gates pass

Blocked by

PR 2

References

• docs/internal/EDGEZERO_MIGRATION.md — Phase 1, PR 8
• Part of EdgeZero Integration #480