fix(install): force exec bits from git's index on every restore

core.fileMode=false (repo-local or a machine-wide /etc/gitconfig) can
silently drop the +x bit on every tracked script during checkout, which
then surfaces later as a confusing "Permission denied" on whatever
script happens to run next rather than as an obvious failure up front.
ensure_exec_bits() re-applies +x from `git ls-files -s` (mode 100755)
right after every pull, so a restore is self-healing regardless of cause.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bin/sync.py

@@ -43,6 +43,26 @@ def run(*args, capture=False, check=False):
     )
 
 
+def ensure_exec_bits() -> None:
+    """Force +x on every path git tracks as executable (mode 100755), straight
+    from `git ls-files` rather than a hardcoded list - self-maintaining as
+    scripts are added. Guards against core.fileMode=false (repo-local or a
+    machine-wide /etc/gitconfig) silently dropping exec bits on checkout, which
+    otherwise surfaces later as a confusing "Permission denied" on whichever
+    script happens to run next (fetch-ollama.sh, the ncp symlink target, ...)
+    rather than as an obvious failure right here."""
+    if os.name == "nt":
+        return
+    result = run("git", "ls-files", "-s", capture=True)
+    for line in result.stdout.splitlines():
+        mode, _, rest = line.partition(" ")
+        if mode != "100755":
+            continue
+        path = ROOT / rest.split("\t", 1)[1]
+        if path.exists():
+            path.chmod(path.stat().st_mode | 0o111)
+
+
 def linux_stage(script: str, *args) -> None:
     """Run one of the Linux-only bash stages. A no-op on Windows, where apt,
     xfconf, plank and the rest have nothing to act on."""
@@ -252,6 +272,7 @@ def cmd_restore(args) -> int:
     if run("git", "pull", "--ff-only", "origin", "main").returncode:
         print("Pull failed (diverged? stash/commit local changes).")
         return 1
+    ensure_exec_bits()
     restore_db()
     rebuild_env()
     linux_stage("restore-linux.sh", "runtime")