docs: move plans into experiment/, delete archive/

- plans/ → experiment/plans/ (implementation plans belong with experiments)
- Delete archive/backup/ (5 obsolete files superseded by newer versions)
- Update README.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: LinuxDev9002

docs/README.md

@@ -1,17 +1,14 @@
 # docs/
 
-- `README.md` - this file
-- `paper/` - paper source (submodule -> gbpf-paper)
-- `paper-material/` - reference papers (MSched, XRP, etc.)
-- `plans/` - implementation plans (cross-block, preempt, xcoord, msched)
-- `plans/archived/` - superseded plan versions
-- `driver_docs/` - NVIDIA UVM driver analysis
-- `eval/` - evaluation reports and agent case study
-- `eval/agent/` - AI-assisted exploration analysis (q1-q6)
-- `eval/multi-tenant-memory/` - multi-tenant memory reports
-- `eval/multi-tenant-scheduler/` - multi-tenant scheduling reports
-- `eval/suggestions/` - evaluation design notes
-- `resubmission-v2/` - SOSP resubmission drafts and analysis
-- `experiment/` - experiment infrastructure, profiling, verification
-- `presentation/` - slide decks (LPC, GPU MODE)
-- `archive/` - legacy/obsolete material
+- `paper/` — paper source (submodule → gbpf-paper)
+- `paper-material/` — reference papers (MSched, XRP, etc.)
+- `resubmission-v2/` — SOSP resubmission drafts and analysis
+- `eval/` — evaluation reports and agent case study
+  - `agent/` — AI-assisted exploration analysis (q1-q6)
+  - `multi-tenant-*/` — multi-tenant scheduling/memory reports
+  - `suggestions/` — evaluation design notes
+- `experiment/` — experiment infrastructure, profiling, verification
+  - `plans/` — implementation plans (cross-block, preempt, xcoord, msched)
+  - `plans/archived/` — superseded plan versions
+- `driver_docs/` — NVIDIA UVM driver analysis
+- `presentation/` — slide decks (LPC, GPU MODE)