docs: update stale entry docs and deprecate superseded docs with annotations

- docs/lithosananke/README.md + ROADMAP.md: correct branch topology (no
  lithosananke branch post-split; master is the sole line), mark M7.1 as
  live, and fix build commands (kernel/Makefile, not Makefile.starkernel)
- docs/README.md: refresh current active work (Tripod = Hera/Artemis/Hestia,
  M7.1 live, StarForth v4) and flag INDEX.md as stale
- docs/INDEX.md: add dated-snapshot staleness banner
- Add TARGET-HAL / OBSOLETE / SUPERSEDED banners to stale HAL, physics,
  heartbeat, and DoE docs under docs/working/ (annotation only, no deletions)

docs/working/experiments/02-experiments/factorial-doe/guide.md

@@ -1,4 +1,8 @@
 <!-- Moved from docs/02-experiments/factorial-doe/guide.md to docs/working/experiments/02-experiments/factorial-doe/guide.md on 2026-06-16 (docs reorg Phase 2) -->
+
+> **⚠ OBSOLETE (flagged 2026-10-09).** Describes the retired per-loop Makefile-toggle
+> architecture, replaced by the L8 Jacquard runtime mode selector. Kept for historical record.
+
 # StarForth Complete 2^6 Factorial Design of Experiments
 
 ## Overview

docs/working/experiments/02-experiments/factorial-doe/incompatible-configs.md

@@ -1,4 +1,8 @@
 <!-- Moved from docs/02-experiments/factorial-doe/incompatible-configs.md to docs/working/experiments/02-experiments/factorial-doe/incompatible-configs.md on 2026-06-16 (docs reorg Phase 2) -->
+
+> **⚠ OBSOLETE (flagged 2026-10-09).** Build-time incompatibility handling for the retired 2^6
+> toggle experiment, replaced by the L8 Jacquard mode selector. Kept for historical record.
+
 # Handling Incompatible Configurations in Factorial DoE
 
 ## Overview

docs/working/experiments/02-experiments/factorial-doe/index.md

@@ -1,4 +1,8 @@
 <!-- Moved from docs/02-experiments/factorial-doe/index.md to docs/working/experiments/02-experiments/factorial-doe/index.md on 2026-06-16 (docs reorg Phase 2) -->
+
+> **⚠ OBSOLETE (flagged 2026-10-09).** Index for the retired 2^6 factorial toggle
+> architecture, replaced by the L8 Jacquard mode selector. Kept for historical record.
+
 # StarForth Complete 2^6 Factorial DoE - Documentation Index
 
 ## Overview

docs/working/experiments/02-experiments/factorial-doe/workflow.md

@@ -1,4 +1,9 @@
 <!-- Moved from docs/02-experiments/factorial-doe/workflow.md to docs/working/experiments/02-experiments/factorial-doe/workflow.md on 2026-06-16 (docs reorg Phase 2) -->
+
+> **⚠ HISTORICAL (flagged 2026-10-09).** Documents the completed 2025-11-19 factorial
+> campaign whose data informed the current L8 design; the toggle architecture it runs on is
+> retired. Kept as a record.
+
 # Factorial DoE Analysis Workflow
 
 ## End-to-End Process