docs: the map, a fresh index, and a register of dead ideas and revised claims

docs/CLAUDE.md Phase 1 output, after the reorganisation.

- docs/README.md: rewritten as the map -- where each kind of document
  lives, which one to believe (CLAUDE.md, FABRIC, v4.0.0, reference/,
  BRINGUP, code), how to retire a document.
- docs/INDEX.md: regenerated from the tracked tree, 489 rows, every
  document with a status (the 2026-06-16 snapshot was stale).
- docs/DEAD-AND-REVISED.md (new): what was abandoned (L4Re, the hal_*
  contract, ACL RWT, the Hermes VM, elevation, the knowledge factor, ...)
  and what was corrected (ACL overhead, versions, block rules, parity
  baseline, ...), each with its date and record.
- docs/DELETE-CANDIDATES.md: 12 duplicates, awaiting a ruling; nothing
  deleted.
- CLAUDE.md: versions corrected (3.2.0 / 2.1.0).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -104,7 +104,7 @@ on both branches, plus the now-orphaned `scripts/pgo-workload.sh`. Verified
 Also proved out and documented, for the first time, that the hosted VM
 starts cleanly not just on amd64 but on aarch64 and riscv64 too (cross-built,
 run under `qemu-{aarch64,riscv64}-static` user-mode emulation) —
-`docs/lithosananke/hosted-acceptance-test/README.md`. This is what surfaced
+`docs/reference/hosted-acceptance-test/README.md`. This is what surfaced
 the `blk_ram` sizing bug above.
 
 ## 2026-07-07 – 2026-07-08 — Kconfig build-configuration system (both, committed on `lithosananke`)