bug pass: whole console lines, a quiet SCI, an honest reserve warning

- schinit, schinitd and vgpud build every message from pieces, one
  write() each, so a job starting on another CPU landed mid-line:
  "schinitd: starting vgpud: os.schos.resolvconfno virtio-gpu on this
  machine". They now collect a line and write it at the newline;
  resolvconf's verbose line is one write with its prefix.
- The ACPI SCI registers IRQ_QUIET. A desktop's SCI never fires, and the
  poller took two seconds of silence for a misrouted line ("irq 9:
  nothing has arrived on it") and called the handler every tick. A line
  is only exempt while every handler on it is quiet.
- The loader claims each segment from where the last one's claim ended,
  so two segments sharing a page no longer ask for it twice. When a
  claim is still refused, it names the memory-map entries in the way.
- Stale divesymlink() declaration gone; the kernel.md struct table
  re-measured (inode, buf and file pools grow from slabs now).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4

cmd/resolvconf/main.c

@@ -181,9 +181,15 @@ main(int argc, char *argv[])
 
     // Worth one line under -v, because it is the moment names start working
     // and somebody watching a verbose boot may be waiting to know it.
+    // One write(), prefix and all: two would let another job's line land
+    // between them, which a verbose boot on real hardware showed as
+    // "os.schos.keymapnameserver 192.168.1.1".
     if (verbose_boot) {
-        puts_("resolvconf: ");
-        write(1, buf, n);
+        static char line[sizeof("resolvconf: ") + sizeof(buf)];
+        int k = 0;
+        for (const char *p = "resolvconf: "; *p; p++) line[k++] = *p;
+        for (int j = 0; j < n; j++) line[k++] = buf[j];
+        write(1, line, k);
     }
     return 0;
 }