feat(kernel): the proxy Zuse -- a stick's first boot mints its own Zuse; the genesis marker's version 2 (#92, Task 1)

Task 1 of plan 2026-10-29-stick-5, accepted in full:
- amd64, aarch64, riscv64: PARITY:V4_POST tests=538 pass=538 fail=0,
  POST: PASSED, [zuse@Hera] ok>; dict_hash 0xfec8c47cfc6f437f on the three
- the PC stick loaded high: 538/538, POST: PASSED, the prompt
- make -C v4 test-32: 39 programs, 0 failures

The logs of the acceptance boots (aarch64 044253, riscv64 044558, the stick
high 044725; amd64 044115 is already in), the four accept-*.txt verdicts and
test-32's output. The plan's Task 1 steps ticked; FABRIC-3 XLVIII.8.

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

docs/fabric/FABRIC-3.md

@@ -6330,3 +6330,7 @@ Plan `docs/v4.0.0/plans/2026-10-29-stick-5-proxy-zuse-and-real-zuse.md`, Task 1;
 - **Left as it is (the plan's order):** a genesis whose marker write fails leaves Zuse on the
   identity partition with no marker naming her; that stick then logs no one in until it is
   rewritten. Said once, "Zuse: genesis marker write failed -- headless".
+- **Accepted** (`scripts/nightly.sh accept` amd64, aarch64, riscv64, stick-high; `make -C v4
+  test-32`): `PARITY:V4_POST tests=538 pass=538 fail=0` and `POST: PASSED` on all three and the
+  stick loaded high; `dict_hash 0xfec8c47cfc6f437f` on the three, unchanged (Task 1 adds no word);
+  test-32: 39 programs, 0 failures.

docs/v4.0.0/plans/2026-10-29-stick-5-proxy-zuse-and-real-zuse.md

@@ -146,7 +146,7 @@ xHCI USB sticks, `scripts/qemu_session.py`.
 - **The Artemis partition must be formatted to take the marker:** `blk_subsys_confirm_format` only
   if the slot is provisional and its `artemis_sig_t` checked out (§4).
 
-- [ ] **Step 1: Failing tests** (harness):
+- [x] **Step 1: Failing tests** (harness):
   - **`genesis`** (three ISAs): a fresh data stick (`DATASTICK=1 ZUSEDISK=`), built once into the
     session directory (`DATASTICK_IMG=<work>/data.img DATASTICK_DEP=`) and booted twice, one QEMU at
     a time. First boot: the genesis line, `[zuse@Hera] ok> `, `3 4 + .` → `7  ok`. Second boot:
@@ -155,12 +155,12 @@ xHCI USB sticks, `scripts/qemu_session.py`.
     reaches the prompt. Today: FAIL (headless).
   - **Changed:** `stick_boot` expected the blank stick headless; it now expects the genesis line and
     the prompt.
-- [ ] **Step 2:** Run each: FAIL as listed.
-- [ ] **Step 3:** Implement.
-- [ ] **Step 4:** The new sessions pass; regression: `zuse` (the pair, version 1: logs in as the
+- [x] **Step 2:** Run each: FAIL as listed.
+- [x] **Step 3:** Implement.
+- [x] **Step 4:** The new sessions pass; regression: `zuse` (the pair, version 1: logs in as the
   proxy), `stick_zuse`, `stick_artemis`, `two_sticks`, `artemis_unsigned`, `raw_ident`, `hotplug`,
   `midpull`, `waitpull`, `typeahead`, the GPT modes, `v3_keys` (v3's genesis and marker unchanged).
-- [ ] **Step 5:** Suite; full acceptance; commit `feat(kernel): the proxy Zuse -- a stick's first
+- [x] **Step 5:** Suite; full acceptance; commit `feat(kernel): the proxy Zuse -- a stick's first
   boot mints its own Zuse; the genesis marker's version 2` with the logs.
 
 ### Task 2: Artemis grows to fill the stick