fix(edit,nano): bracketed paste + bounded prompts so Save-as cannot flood

Enable xterm bracketed paste (?2004h/?2004l), parse ESC[200~…201~ as a single
paste event, insert paste in the buffer with one undo step, and replace
prompt input with first-line sanitized text capped by BARE_EDIT_MAX_PROMPT.
Cap typed prompt length for terminals without bracketed paste. Extend tests and
rebuild kernel /bin edit and nano bundles.

packages/bare-os-seeder/kernel/etc/bare-os/posix_utilities.json

@@ -1,7 +1,7 @@
 {
   "schema": 2,
   "profileId": "bare-os-posix-like",
-  "generatedAt": "2026-04-21T22:22:05.245Z",
+  "generatedAt": "2026-04-21T22:34:00.573Z",
   "note": "Sparse POSIX Issue 7 coverage hints for /bin utilities. Omitted command names are not yet profiled here.",
   "commandIndex": [
     {
@@ -12,10 +12,6 @@
       "name": "awk",
       "tier": "tier1_bin"
     },
-    {
-      "name": "bare-sshd",
-      "tier": "tier1_bin"
-    },
     {
       "name": "baretop",
       "tier": "tier1_bin"