FABRIC-3.md: open new living document (bare metal boot); close FABRIC-2.md

FABRIC-2.md closed/archival as of 2026-09-04 -- its full punch list
(§I) was worked through to completion this session. FABRIC-3.md opens
as the new living document, topic: bare metal boot (FABRIC-2.md §I.6's
own Milestone 8, the one item that couldn't close from a coding
session -- needs a real machine and a human present).

First task written up before executing, per this series' own standing
discipline: merge v2.0.1 into master and verify build/function
equivalence on a clean master tree. Investigated the branch topology
first -- master is a strict ancestor of v2.0.1 (47 commits behind, no
divergent history), so this is a pure fast-forward, not a real merge.

Updated FABRIC-4.md's and .claude/CLAUDE.md's stale pointers at
FABRIC-2.md as "current/living" to point at FABRIC-3.md instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019YcT3H2PQeyujrzjqS3Var

FABRIC-2.md

@@ -1,10 +1,14 @@
 # FABRIC-2.md — the Stadium, continued again
 
-**Status:** Living working document, opened 2026-08-25 as the successor to `FABRIC-1.md`
-(now closed/archival — see its own header). This document does not repeat `FABRIC-1.md`'s
-design argument or history; it restates only outcomes, with pointers back to the section
-that derived them. Read `FABRIC-0.md` for the original "why," `FABRIC-1.md` for everything
-derived through 2026-08-25, this document for what's left as of that date onward.
+**Status: CLOSED/ARCHIVAL as of 2026-09-04.** Was the living working document, opened
+2026-08-25 as the successor to `FABRIC-1.md`. Closed after §I (the full consolidated punch
+list) was worked through to completion — every item either closed with a dated note or
+correctly left open pending a physical machine (§I.6). `FABRIC-3.md` is the new living
+document, topic **bare metal boot** — read that one first. This document does not repeat
+`FABRIC-1.md`'s design argument or history; it restates only outcomes, with pointers back to
+the section that derived them. Read `FABRIC-0.md` for the original "why," `FABRIC-1.md` for
+everything derived through 2026-08-25, this document for everything from 2026-08-25 through
+2026-09-04.
 
 **Provenance.** Everything in Section A below is a full, non-sampled carry-forward of every
 open (`- [ ]`) item in `FABRIC-1.md` as of 2026-08-25 — 51 items, confirmed by