Rename FABRIC series: FABRIC.md->0, FABRIC-2.md->1, FABRIC-3.md->2, FABRIC-4.md unchanged

FABRIC.md -> FABRIC-0.md
FABRIC-2.md -> FABRIC-1.md
FABRIC-3.md -> FABRIC-2.md (the current/living document)
FABRIC-4.md unchanged (new #3 to follow separately)

Every cross-reference repo-wide updated to match, including doc-comment
citations inside kernel source (.c/.h) files -- done via an ordered
placeholder substitution (FABRIC-3.md->placeholder2, FABRIC-2.md->
placeholder1, FABRIC.md->placeholder0, then placeholders resolved to
final names) in a single pass per file to avoid double-shifting
already-renamed references.

One line in capsules/font.4th grew past the 64-char block-format limit
as a side effect of the longer filename; shortened it and reverified
with mkcapsule --lint (34/34 pass) before rebuilding.

Verified 3-arch boot to ok> (amd64/aarch64/riscv64, each in the
foreground) after the fix; logs and DoE CSVs from this session's
verification runs included per this repo's own audit-artifact
convention.

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

.claude/HERMES.md

@@ -5,10 +5,10 @@
 ---
 
 > **SUPERSEDED (Captain Bob, 2026-08-15).** This document is no longer authoritative.
-> `FABRIC.md`/`FABRIC-2.md` (repo root — read `FABRIC-2.md` first, it is the current/living
+> `FABRIC-0.md`/`FABRIC-1.md` (repo root — read `FABRIC-1.md` first, it is the current/living
 > one) are the sole design-of-record for Hermes work now. Kept here as historical record
 > only — note its message-layout table (8 cells) is confirmed stale against the real shipped
-> capsule (9 cells, `capsules/hermes/init.4th`), see `FABRIC-2.md`. Do not read this for
+> capsule (9 cells, `capsules/hermes/init.4th`), see `FABRIC-1.md`. Do not read this for
 > current design authority. See `.claude/CLAUDE.md`'s own pointer.
 
 ---