fix(sessions): add fix-missing cleanup path for orphaned store entries

Introduce a sessions cleanup flag to prune entries whose transcript files are missing and surface the exact remediation command from doctor to resolve missing-transcript deadlocks.

Made-with: Cursor
(cherry picked from commit 690d3d596b)

src/commands/doctor-state-integrity.ts

@@ -438,6 +438,7 @@ export async function noteStateIntegrity(
           `- ${missing.length}/${recentTranscriptCandidates.length} recent sessions are missing transcripts.`,
           `  Verify sessions in store: ${formatCliCommand(`openclaw sessions --store "${absoluteStorePath}"`)}`,
           `  Preview cleanup impact: ${formatCliCommand(`openclaw sessions cleanup --store "${absoluteStorePath}" --dry-run`)}`,
+          `  Prune missing entries: ${formatCliCommand(`openclaw sessions cleanup --store "${absoluteStorePath}" --enforce --fix-missing`)}`,
         ].join("\n"),
       );
     }