docs: archive the frozen stage code as one compressed tarball

docs/history kept six stages with a full copy of the project under code/,
3.8 mb of sources duplicated from stage to stage and already superseded. store
them as docs/history/code-snapshots.tar.gz, 0.66 mb, and extract one in place
to read it. every stage's notes.md stays browsable, and the index says where the
code went and how to get it back.

the top-level README points at the archive too. its other two links into
docs/history, 21-micro and 35-bench, were notes that were never kept and do not
resolve; the index now records that.

1 files changed, 0 insertions, 35 deletions

diff --git a/docs/history/07-zygote/code/mkgenome.c b/docs/history/07-zygote/code/mkgenome.c
deleted file mode 100644
index 7d9f0bc..0000000
--- a/docs/history/07-zygote/code/mkgenome.c
+++ /dev/null
@@ -1,35 +0,0 @@
-/* assembles the genome at a fixed origin and writes it as a c header */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#define ORG 48000
-static char tok[30000][99];
-static int lab[30000], nt, img[17536], n;
-static char *ops = "q@!$_~cjzr,?.+-*&|^><";
-static int val(char *s)
-{
-	int j; char *e; long v;
-	for (j = nt; j--;) if (tok[j][0] == ':' && !strcmp(tok[j] + 1, s)) return lab[j];
-	v = strtol(s, &e, 0);
-	if (!*s || *e) { fprintf(stderr, "unknown label %s\n", s); exit(1); }
-	return (int)v;
-}
-static void put(int w) { if (n >= 17536) exit(1); img[n++] = w; }
-int main(void)
-{
-	int pass, i; char *q, *c;
-	while (nt < 30000 && scanf("%98s", tok[nt]) == 1) nt++;
-	for (pass = 0; pass < 2; pass++)
-		for (n = i = 0; i < nt; i++) {
-			q = tok[i];
-			if (*q == '"') while (*++q) put(*q);
-			else if (*q == ':') lab[i] = ORG + n;
-			else if (!q[1] && (c = strchr(ops, *q))) put((c - ops) * 2);
-			else if (*q == '#') put(pass ? val(q + 1) : 0);
-			else put(pass ? val(q) * 2 + 1 : 1);
-		}
-	printf("#define GORG %d\n#define GLEN %d\nstatic const int genome[] = {", ORG, n);
-	for (i = 0; i < n; i++) printf("%s%d", !i ? "\n" : i % 16 ? "," : ",\n", img[i]);
-	printf("\n};\n");
-	return 0;
-}