release: v4.0.0-alpha.3; the proofs run capped to fit the server

v4.0.0-alpha.2's release run (200) was killed in the StarForth session:
Isabelle's defaults (Java 4 GiB, a thread per CPU). scripts/nightly.sh
proofs now runs one thread, Java 512 MiB, Poly/ML 900 MiB, through a
settings file of a home made for the run (heaps linked to the user's):
47 s, ~1.8 GiB, logs/20261107-195341. Nothing was published from alpha.2;
its tag stays. LITHOS_VERSION 4.0.0-alpha.3. FABRIC-3.md XLVII.6.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2

docs/fabric/FABRIC-3.md

@@ -6178,3 +6178,16 @@ packages, which also fetched Isabelle into the workspace and pointed `/usr/local
 2026-11-07): the tag stays where it is; `release.yml` runs `init INIT_PROOFS=0` (as
 `nightly-docs.yml` does), `LITHOS_VERSION` becomes `4.0.0-alpha.2`, and `v4.0.0-alpha.2` is the
 first published alpha.
+
+### 6. v4.0.0-alpha.2 not published either; v4.0.0-alpha.3
+
+PR #130 merged (`2d43db25`, acceptance run 199; run 197 before it failed one riscv64 check, #131);
+`v4.0.0-alpha.2` tagged there. Its release run (200) passed acceptance and used the image's
+Isabelle and HOL-Library, as XLVII.5 meant -- then the StarForth session was killed (exit 137) in
+the proofs: Isabelle ran with its defaults, Java's heap up to 4 GiB and a thread per CPU, more than
+the server (3.8 GiB, ~2.3 GiB free with the wikis stopped; perhaps a per-job cap besides). Capped
+-- one thread, Java 512 MiB, Poly/ML 900 MiB, in a settings file of a home made for the run, its
+heaps linked to the user's -- the session passes in 47 s at ~1.8 GiB, through
+`scripts/nightly.sh proofs` itself (`logs/20261107-195341`). Nothing was published. Ruled (Captain
+Bob, 2026-11-07): the tag stays; `LITHOS_VERSION` `4.0.0-alpha.3`, the first published alpha; the
+review list begun meanwhile goes to the milestone v4.0.0-alpha.4.