feat(v4): the mesh boot to spec -- Hera born empty in the kernel's fabric; births, kills, every node stepping together (#189)

ENGINE step 4 Phase 1, Tasks 5b-5d, and the edge cases (Captain Bob, 2026-11-13: "Build it to proper
spec"; "Check for the edge cases"; "Yes, add it to v4-checks").

- v4/system/mesh.c, v4/include/v4/mesh.h: the nucleus assembled by the ROM and given to Hera as F18
  cells; Hera born empty at place 0, the kernel on port 0, the console on port 1; told she is 10, in the
  registry, the kernel's words, FORTH-79, sealed, POST, the kernel's capsules. NODE-BORN / NODE-KILL in
  the owner's room.
- No scheduler: v4_mesh_tell returns once the node told says how its text ended, and
  v4_mesh_step / v4_mesh_busy let the host step the fabric while it waits, so nodes run between
  lines as during them. A text left "waiting" is owed its end: the next line ends it "Interrupted"
  and is then run (MESH.md 7b.6).
- kernel: sk_v4.c boots through the mesh; its idle steps the fabric while a node can run, and halts
  only when none can (#151 kept). stadium_return_quota and stadium_ops_forget on a kill.
- Tests: v4/tests/test_mesh_boot.c (32 checks: the boot, births, kills, rebirth, a live number, a
  fault, no such node, Hera not killing herself, no room, a line too long, a node running for ever,
  a wait broken by the next line), run by `make -C v4 test` and under ASan+UBSan by `sanitize`
  (v4-checks); kernel/tests quota return; scripts/qemu_session.py births() and the edges on bare
  metal.
- Docs: ENGINE.md 6 "who runs next" struck (settled: no scheduler); the Phase 1 plan; FABRIC-3
  XLVIII.23; .claude/memory/rules.md: alpha.5 closed to new work.
- Evidence: v4-checks 80 programs under the sanitizers, 0 failures; the hosted builds alike; two
  stopped v4-checks runs labelled STOPPED; three development amd64 boots labelled.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017RzZgrf7V7Zk2iczBXDRbm

logs/20261113-153617/amd64/README.md

@@ -0,0 +1 @@
+Development boot, not acceptance evidence (2026-11-13): an amd64 boot of the mesh boot under development (#189 Phase 1, Tasks 5b-5d), before the edge cases. POST passed (539/539). The session checks' results are not recorded in this serial log. The protocol run is the evidence.

logs/20261113-153958/amd64/README.md

@@ -0,0 +1 @@
+Development boot, not acceptance evidence (2026-11-13): an amd64 boot of the mesh boot under development (#189 Phase 1, Tasks 5b-5d), before the edge cases. POST passed (539/539). The session checks' results are not recorded in this serial log. The protocol run is the evidence.

logs/20261113-154853/amd64/README.md

@@ -0,0 +1 @@
+Development boot, not acceptance evidence (2026-11-13): the amd64 boot that checked the edge cases on bare metal (#189: "Check for the edge cases"). Every session check passed (RESULT: PASS), including a node running SPIN for ever, the prompt answering while it runs, and 11 KILL with the Stadium CONSERVED. The protocol run is the evidence.

logs/20261113-161229/v4-checks/STOPPED.md

@@ -0,0 +1 @@
+STOPPED, not a result: this v4-checks run was stopped partway (2026-11-13) because v4/Makefile changed under it -- a sanitized mesh-boot test was added to `sanitize` (Captain Bob: "Yes, add it to v4-checks"). No failure had been seen. The run on the final tree is the evidence.

logs/20261113-161614/v4-checks/STOPPED.md

@@ -0,0 +1 @@
+STOPPED, not a result: this v4-checks run (2026-11-13) was stopped by the 10-minute limit set on the command that ran it, partway through the sanitizer runs (the 32-bit depth test). No failure had been seen. The run with a longer limit is the evidence.