fix(bootstrap): create the nano config dir world-searchable

felis-nano runs as a systemd DynamicUser, so it can read
/etc/felis/felis.toml only if others may search /etc/felis.
write_nano_config made the directory with a bare mkdir -p, which takes
its mode from root's umask. On a host hardened to umask 027 that is
0750: nano exits on "permission denied", the unit restarts every five
seconds, and no login gets through.

A missing directory is now created 0755 explicitly. An existing one
keeps its mode, because the full install sets it to 0700 to protect its
secrets and widening that from the nano path would expose them. A nano
unit locked out that way is left for the install to report.

The harness runs the extracted function under umask 027 and checks both
cases. Reverting to the bare mkdir fails the first; an unconditional
chmod 0755 fails the second. The mode checks skip on filesystems that
ignore chmod, such as Git Bash on NTFS.

deploy/bootstrap_test.sh

@@ -179,6 +179,33 @@ out="$(run_carry)"
 expect "both encoder-written tables are carried (first)" '  tag = "littleskin"' "$out"
 expect "both encoder-written tables are carried (second)" '  tag = "guild"' "$out"
 
+# --- write_nano_config leaves the unit able to read its config ---------------------------
+# felis-nano runs as a DynamicUser, so the directory must be searchable by others under a
+# hardened umask too -- but an existing one, which the full install locks to 0700 for its
+# secrets, must not be widened.
+
+wblock="$(awk '/^write_nano_config\(\) \{/,/^}/' "$BS")"
+[ -n "$wblock" ] || { echo "FAIL: no write_nano_config found in $BS"; exit 1; }
+[ "$(printf '%s\n' "$wblock" | wc -l)" -lt 40 ] \
+  || { echo "FAIL: the extracted block is not the function -- did its closing brace move?"; exit 1; }
+
+run_nano_config() { # state-dir
+  STATE_DIR="$1" bash -c 'umask 027
+    ok() { printf "OK: %s\n" "$*"; }
+    '"$wblock"'
+    write_nano_config'
+}
+
+mkdir "$sdir/probe" && chmod 0700 "$sdir/probe"
+if [ "$(stat -c %a "$sdir/probe")" = 700 ]; then
+  run_nano_config "$sdir/nano" >/dev/null
+  expect "a fresh config dir is searchable under umask 027" 755 "$(stat -c %a "$sdir/nano")"
+  run_nano_config "$sdir/probe" >/dev/null
+  expect "an existing 0700 dir is not widened" 700 "$(stat -c %a "$sdir/probe")"
+else
+  echo "SKIP directory modes: this filesystem ignores chmod"
+fi
+
 # ---------------------------------------------------------------------------------------
 if [ "$fails" -eq 0 ]; then
   echo "ALL PASS"