docs: update stale entry docs and deprecate superseded docs with annotations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- Add TARGET-HAL / OBSOLETE / SUPERSEDED banners to stale HAL, physics,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/lithosananke/ROADMAP.md

@@ -550,13 +550,13 @@ identically afterward.)
 
 ```bash
 # Build
-make -f Makefile.starkernel ARCH=amd64 STARFORTH_ENABLE_VM=1
+make -f kernel/Makefile ARCH=amd64 STARFORTH_ENABLE_VM=1
 
 # Run QEMU
-make -f Makefile.starkernel ARCH=amd64 STARFORTH_ENABLE_VM=1 qemu
+make -f kernel/Makefile ARCH=amd64 STARFORTH_ENABLE_VM=1 qemu
 
 # Clean
-make -f Makefile.starkernel ARCH=amd64 clean-kernel
+make -f kernel/Makefile ARCH=amd64 clean-kernel
 ```
 
 ---
@@ -564,13 +564,9 @@ make -f Makefile.starkernel ARCH=amd64 clean-kernel
 ## Branch Relationship
 
 ```
-master (hosted StarForth)
-    │
-    ├── lithosananke (kernel branch)
-    │       │
-    │       └── M7 complete, M7.1 design complete
-    │
-    └── starkernel-junkyard (legacy, can delete)
+master (post-split: sole LithosAnanke production line — the old
+lithosananke/master two-branch topology no longer exists in this repo)
+    └── M0–M7 complete, M7.1 live (capsules / Tripod / Stadium / ACL)
 ```
 
 ---