Phase 5 close-out: Isabelle pass, doc sweep, SBOM, version bump (FABRIC-3.6.md tasks 5.1-5.4)

5.1: Isabelle/HOL pass (52 theories, clean) -- restated the boundary rather
than just citing the green build: proof/ scope was already entirely
outside this reshuffle's footprint (src/starkernel/, capsules/*.4th),
so the boundary is unchanged, not moved.

5.2: Documentation sweep. CLAUDE.md's stale WIP banner and Tripod fleet
description updated now that Phases 0-4 have actually landed (Hera/
Artemis/Hestia, no Hermes). MANIFEST.md rides the strip -- hermes/init.4th's
block table replaced with a deletion note, init.4th/doe-campaign.4th/
hestia/init.4th entries corrected to match the post-strip live files.
Confirmed the TRIPOD.md/0.1 contradiction was already resolved (2026-08-13).
Settled the superseded-docs call explicitly: archive as-is, do not rewrite.
Fixed experiments/bare_metal/README.md's block-size framing (still said
1024-byte budget; real rule is 64 chars x 16 lines). K-qualification
checked clean against the two living documents; full retroactive sweep
of the closed archival FABRIC corpus explicitly declined as disproportionate.

5.3: make sbom. Installed syft (user-local, approved). Found and fixed a
real Makefile bug while at it -- the sbom target hardcoded
--source-name StarForth, so DocumentName was wrong even after regenerating.

5.4: LITHOS_VERSION 2.0.0 -> 2.1.0, engine VERSION 3.1.0 -> 3.2.0 (minor,
per the dictionary-visible-only rule). Replaced the stale version-comment
block in Makefile.starkernel (had the odd/even LTS rule backwards) and
docs/lithosananke/ROADMAP.md's retired versioning-policy section with the
ratified ladder. Verified on all three architectures; riscv64's first pass
hit a transient virtio_blk timeout during boot-time Zuse genesis mint,
reported and confirmed non-reproducing on an immediate clean retry.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

experiments/bare_metal/README.md

@@ -137,16 +137,22 @@ before building) rather than wiring it into `doe.4th`.
 ## `.4th` File Structure
 
 Every `.4th` file must follow StarForth's block format.  The block system
-maps source text to 1024-byte logical blocks; the `Block NNNN` header tells
-the loader which block slot to fill.
+maps source text to logical blocks; the `Block NNNN` header tells the loader
+which block slot to fill.
 
 **Mandatory rules:**
 
 1. The first line of each logical block must be `Block NNNN` (capital B,
    single space, decimal integer).
-2. Block numbers must be unique within a single capsule file.
+2. Block numbers must be unique within a single capsule file, and must fall
+   in `[2048, 5120)`.
 3. Blocks are loaded in file order and executed top-to-bottom.
-4. Each block can hold up to 1024 bytes of source text.
+4. Each block can hold at most 16 content lines, each at most 64 characters
+   long (`validate_forth_blocks` in `tools/mkcapsule.c`, corrected 2026-09-19
+   against the tool itself — **not** a 1024-byte budget: 8 lines of 128
+   characters is 1024 bytes and still fails, since the limit is enforced
+   per-line and per-line-count, not as a total byte count). Verify with
+   `mkcapsule --lint capsules/`, not `wc -c`.
 5. Comments use `( ... )` — parentheses with spaces inside.
 6. Word definitions use `: NAME ... ;` — standard FORTH-79.