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Per local/AGENTS.md Rule 2 (NO OVERLAY-STYLE PATCHES — AMENDED 2026), big external projects must NOT have source forks in local/sources/. WirePlumber's Red Bear edits now live as external patches in local/patches/wireplumber/, matching the established mesa and libdrm migration pattern. The patch contains the redox_compat/ shim headers that bridge relibc gaps for the meson subprojects, and any build script adjustments for cross- compilation under the Redox toolchain. The local/sources/wireplumber/ fork is preserved as a historical reference but no longer used by the build system. A follow-up commit will remove it after we verify a clean rebuild from upstream git + patch.