release: v4.0.0-alpha.2; release.yml keeps the image's Isabelle [skip ci]

v4.0.0-alpha.1's release run (196) was killed in the proofs: release.yml's
full `make init` fetched Isabelle into the workspace and pointed isabelle
at it, without the image's prebuilt HOL-Library, so the proofs built it
from scratch. Nothing was published. Ruled: the tag stays; release.yml runs
`init INIT_PROOFS=0`; LITHOS_VERSION 4.0.0-alpha.2, the first published
alpha. FABRIC-3.md XLVII.5, CHANGELOG.

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

kernel/Makefile

@@ -95,6 +95,9 @@ endif
 #             v3.0.0, the first LTS, is no longer the next number -- an LTS line takes the next
 #             odd major when §XXX.5's criteria are met. The engine stays 3.2.0. Alphas are
 #             numbered (-alpha.N); a release repository takes each version once.
+#   v4.0.0-alpha.2 — the first published alpha: v4.0.0-alpha.1 (233025da) was accepted and tagged,
+#             but its release run's proofs step built HOL-Library from scratch and was killed, so
+#             nothing was published; the tag stays where it is (Captain Bob, 2026-11-07).
 # LITHOS_VERSION (kernel) and VERSION (embedded StarForth engine) are independent
 # and do not auto-sync (§XXX.4) — do not infer a relationship if they ever coincide.
 # Engine VERSION bumps at tag time by what actually changed (§XXX.6): major = any
@@ -103,7 +106,7 @@ endif
 # the messaging layer was replaced by kernel-Hermes, PLOT/FB-* relocated to Hestia —
 # all dictionary-visible, no FORTH-79 word semantics changed.
 VERSION       ?= 3.2.0
-LITHOS_VERSION ?= 4.0.0-alpha.1
+LITHOS_VERSION ?= 4.0.0-alpha.2
 
 # ==============================================================================
 # BUILD PATHS