exe-ssh-config-generator: fix Include line trapped inside Host block

The ensure_include() function checked for the Include line's existence
but not its position. If a user added a Host block above the Include
line, it became scoped to that block (SSH Host blocks end at the next
Host/Match, not at blank lines), so the included config was only
processed when connecting to that specific host.

Now ensure_include() verifies the Include appears before any Host/Match
directive, and moves it to the top if it has drifted inside a block.

Prompt: I ran exe-ssh-config-generator with two keys and "ssh phil-dev"
wasn't picking up the generated config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: philz

bin/exe-ssh-config-generator

@@ -159,12 +159,31 @@ def ensure_include():
     with open(SSH_CONFIG, "r") as f:
         content = f.read()
 
-    if INCLUDE_LINE in content:
+    lines = content.splitlines(True)
+    # Find where the Include line is (if present) and where Host/Match blocks start.
+    include_idx = None
+    first_host_idx = None
+    for i, line in enumerate(lines):
+        stripped = line.strip()
+        if stripped == INCLUDE_LINE:
+            include_idx = i
+        if first_host_idx is None and (stripped.startswith("Host ") or stripped.startswith("Match ")):
+            first_host_idx = i
+
+    if include_idx is not None and (first_host_idx is None or include_idx < first_host_idx):
+        # Include exists and is before any Host/Match block — nothing to do.
         return
 
+    if include_idx is not None:
+        # Include exists but is inside a Host/Match block — remove it and re-prepend.
+        del lines[include_idx]
+        # Also remove a trailing blank line if one was left behind.
+        if include_idx < len(lines) and lines[include_idx].strip() == "":
+            del lines[include_idx]
+
     # Prepend the include so it takes priority
     with open(SSH_CONFIG, "w") as f:
-        f.write(INCLUDE_LINE + "\n" + content)
+        f.write(INCLUDE_LINE + "\n\n" + "".join(lines))
     print(f"  added include to {SSH_CONFIG}")