docs: the submit check cannot reliably recognise a multi-line paste

It does match one Claude shows inline when the first line has 24+
non-space characters; it misses a short first line and the
[Pasted text #N +k lines] placeholder. Say "cannot reliably" instead of
"cannot".

Co-Authored-By: Christian Haberl <116439789+christianhaberl@users.noreply.github.com>
Co-Authored-By: Claude <noreply@anthropic.com>

src/cron/cron-service.ts

@@ -97,7 +97,7 @@ const CRON_PSEUDO_FS_TREES: readonly string[] = ['/proc', '/sys', '/dev'];
 /** Sync blocklist for the create/update workingDir gate (no settings extras). */
 const CRON_WORKING_DIR_BLOCKED_TREES: readonly string[] = [...DEFAULT_BLOCKED_TREES, ...CRON_PSEUDO_FS_TREES];
 
-/** Prompt delivery is single-line only: the submit check cannot recognise a multi-line paste. */
+/** Prompt delivery is single-line only: the submit check cannot reliably recognise a multi-line paste. */
 const HAS_NEWLINE = /[\r\n]/;
 
 /** The three session calls prompt delivery needs, so it can be tested without a PTY. */
@@ -538,7 +538,7 @@ export class CronService {
   /**
    * Resolves the prompt text and enforces the single-line constraint: a job
    * fires unattended, and the submit check that re-presses an ignored Enter
-   * cannot recognise a multi-line paste in the composer (typed mode), so a
+   * cannot reliably recognise a multi-line paste in the composer (typed mode), so a
    * stranded prompt would go unnoticed; in paste mode the newlines reach the
    * CLI as keys. Rather than risk an unattended agent's instructions, fail the
    * run with a clear error. A prompt FILE may end with trailing newline(s)