capsules: prune init.4th to Hera alone

Punch list §25 item 0.1 complete.

Verified: all three architectures build clean and boot to the ok> prompt with
Hera alone. Blocks executed are exactly 2057 -> 2049 (-> lib.4th/4050) -> 2050.
Zero occurrences of "Hermes" or "Tripod" in any of the three serial logs, and
the only parity record is MAMA_INIT -- no baby VM is born. mkcapsule --lint
passes 26 files, 0 failing, 0 violations.

Deleted blocks 2051, 2052, 2053, 2054, 2055, 2056, 2058, 2059 -- readiness
handshake, broadcast test, TRIPOD-TEST, HERMES-E2E and the fleet-DoE
scaffolding. Edited 2057 (banner), 2049 (dropped both births with their
CD-INIT calls and the common:msg.4th / process.4th loads, which are wholly
Hermes-dependent; kept lib.4th; VM-TREE and VM-CHILDREN no longer name absent
children) and 2050 (kept the BOOT-BANNER call, dropped the two calls to the
deleted words). capsules/hermes/ and capsules/artemis/ untouched on disk.

New Hera-alone parity baseline, identical across all three ISAs:
  dict_hash=0x3d4e1daf289da94f  capsule_hash=0xb4c4b5559146a3bd
This supersedes the pre-prune baselines in logs/ and is what item 0.10's
double-boot reproducibility check compares against.

Commit contents beyond the item's own edit, noted rather than slipped in:
capsules/BLOCK_MAP.md is regenerated by any build; the three serial logs are
this item's acceptance evidence and CLAUDE.md requires committing them; the
DoE CSVs are auto-extracted by the qemu target on every run. Leaving generated
output from this item's acceptance run for a later item to sweep up would be
worse than including it here.

Reported, not fixed: tools/mkcapsule.c emits two -Wstringop-truncation warnings
on the host build (:404, :562), pre-existing.

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

FABRIC.md

@@ -2005,7 +2005,7 @@ wrong because it is written down, and do not silently implement something differ
 *Nothing in later phases can start until Phase 0 is complete. The engine has nothing to run
 on until there is a tick on all three architectures (§16.1, §16.5).*
 
-- [ ] **0.1 — Prune `capsules/init.4th` to Hera alone.**
+- [x] **0.1 — Prune `capsules/init.4th` to Hera alone.**
   **Delete** blocks 2051, 2052, 2053, 2054, 2055, 2056, 2058, 2059 — the readiness
   handshake, broadcast test, TRIPOD-TEST, HERMES-E2E, and fleet-DoE scaffolding.
   **Edit** the three surviving blocks: 2057 (`BOOT-BANNER` — drop the Tripod lines), 2049