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Round 6 doc cleanup per the explore-agent audit (bg_902cf284): * local/docs/WAYLAND-IMPLEMENTATION-PLAN.md moved to legacy-obsolete-2026-07-25/. The file self-declared as superseded by 3D-DRIVER-PLAN.md on 2026-07-26; its diagnostic content (§§1-2) is redundant with the more detailed QT6-WAYLAND-NULL8-DIAGNOSIS.md (474 lines vs ~60). * local/docs/NETWORKING-STACK-STATE.md moved to legacy-obsolete-2026-07-25/. Fully superseded by NETWORKING-IMPROVEMENT-PLAN.md (63KB, 2026-07-26) which is the canonical current networking plan. The state doc was a static 2026-07-09 snapshot absorbed by the improvement plan. * local/docs/RAPL-IMPLEMENTATION-PLAN.md moved to legacy-obsolete-2026-07-25/. Companion of the already-archived redbear-power-improvement-plan.md. RAPL is a subset of the power/energy subsystem work; planning authority now lives in CONSOLE-TO-KDE-DESKTOP-PLAN.md (which mentions redbear-power). SUPERSEDED.md updated with the three new archival entries including specific reason for each.