feat(v4.0.0): POST is the kernel's -- the boot feeds the cases, and nothing of the harness is on the node

The boot runs POST with the runner (v4/system/post.c) after the capsules:
it feeds the 538 cases to the node and judges them from outside.  A
case's printing no longer reaches the console.  What the cases define
stays in the dictionary, as in v3; the system is sealed after POST and
the boot prints PARITY:V4_SYSTEM word_count=N dict_hash=..., as v3 prints
its parity after POST.

Gone: capsules/v4/post79.4th and its blocks 7000 up; the harness words;
(CATCH) and (EMIT-HOOK), with what EMIT and the prompt loop did for them.

The generator runs v3 on the lines as the kernel sends them, without the
capsule's "T| ".  One expected result follows from that: >IN.initial
prints 6, not 9.

make -C v4 test, sanitize and hosted-check pass; amd64, aarch64 and
riscv64 boot, POST 538 of 538, word_count=411, dict_hash
0x6fb1d09418b189ee on all six: logs/20261007-105118, -105335, -105651.
T{ is unknown at the prompt; RS1 prints 42 42 before and after COLD.  A
scratch build with one expectation changed names the case and ends
PARITY:FAIL, POST: FAILED.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

v4/tools/post79_rules.py

@@ -112,7 +112,9 @@ STANDARD = {
     "TYPE.basic_string": dict(text="72 PAD C! 105 PAD 1+ C! PAD 2 TYPE CR", out="Hi\n", why=D1 + "; and " + RS),
     "TYPE.numbers": dict(text="49 PAD C! 50 PAD 1+ C! PAD 2 TYPE CR", out="12\n", why=D1 + "; and " + RS),
 
-    ">IN.initial": dict(out="9 \n", why="FORTH-79: >IN is the offset into the input, 9 here; v3 prints an address"),
+    # 6: the line is ">IN @ . CR" and >IN is read when "@" has been taken with the blank after it.  It was 9
+    # while the cases were a capsule, whose lines each began "T| " (until MESH.md step 6b).
+    ">IN.initial": dict(out="6 \n", why="FORTH-79: >IN is the offset into the input, 6 here; v3 prints an address"),
 
     "WORD.empty_input": None, "WORD.space_delim": None, "WORD.newline_delim": None, "WORD.tab_delim": None,
     "WORD.comma_delim": None, "WORD.skip_leading": None, "WORD.single_char": None, "WORD.long_word": None,