Fix ingest subprocess dropping the filename argument (C1)

spawn(..., { shell: true }) made Node concatenate argv without quoting;
cmd.exe re-tokenized it and the ingest prompt arrived as a bare "ingest"
with the filename silently discarded, while the run still reported
success. claude.exe is a real executable here, so no shell is needed:
drop shell: true and pass argv directly. isSafeFilename is unchanged
(still correct defence in depth) but its comment now reflects that the
spawn path carries no injection surface today.

.obsidian/plugins/webinar-dash/main.js

@@ -156,18 +156,14 @@ function reconcileConcepts(rows, conceptNames) {
   };
 }
 
-// `shell: true` is required on Windows to resolve `claude.cmd`, which puts the
-// filename into a shell string. Reject anything cmd.exe or a POSIX shell would
-// interpret, plus every control character.
+// Defence in depth. The spawn path no longer uses a shell, so nothing here is
+// load-bearing against injection today — but the guard costs nothing and would
+// still hold if the single-string `shell: true` form is ever needed for a .cmd
+// shim. `^` is cmd.exe's escape character; control characters are rejected
+// because a NUL byte makes spawn() throw synchronously.
 //
-// `^` is cmd.exe's escape character and belongs to the same class Node escapes
-// in its CVE-2024-27980 mitigation for exactly this spawn-through-.cmd shape.
-// Control characters are rejected because a NUL byte makes spawn() throw
-// synchronously, which would otherwise strand the row mid-run.
-//
-// Apostrophes, spaces, cyrillic, em dashes and `!` stay allowed — they are safe
-// inside double quotes and appear in real filenames in this vault. (`!` would
-// matter only under `setlocal enabledelayedexpansion`, which is not in play.)
+// Apostrophes, spaces, cyrillic, em dashes and `!` stay allowed — they appear in
+// real filenames in this vault.
 const UNSAFE_CHARS = /["`$&|;<>%^\u0000-\u001f\u007f]/;
 
 function isSafeFilename(name) {
@@ -492,10 +488,14 @@ class WebinarDashPlugin extends PluginBase {
 
     let child;
     try {
-      child = spawn("claude", ["-p", `ingest "${file.name}"`], {
-        cwd: base,
-        shell: true,
-      });
+      // `claude` resolves to a real .exe here, so libuv finds it via PATH and
+      // PATHEXT with no shell involved. Do NOT add `shell: true`: with a shell,
+      // Node concatenates argv without quoting and cmd.exe re-tokenizes, so the
+      // prompt arrives as two arguments and the filename is silently discarded.
+      // Verified: shell:true yields ["-p","ingest","Webinar script.md"], where the
+      // program sees only "ingest". If a .cmd shim ever needs supporting, use the
+      // single-string form spawn(`claude -p "ingest ${name}"`, { shell: true }).
+      child = spawn("claude", ["-p", `ingest "${file.name}"`], { cwd: base });
     } catch (err) {
       // spawn() throws synchronously for some argument shapes. Without this the
       // timer would run forever and the row would stay disabled until reload.