Cleanup: placeholder Issue #XXX in indexing_executor.py comment

[mrveiss]

Problem

autobot-backend/api/codebase_analytics/indexing_executor.py:29 has a placeholder issue reference:

# Dedicated Indexing Thread Pool (Issue #XXX: Prevent thread starvation)

This was carried over from scanner.py during the decomposition in #2364.

Discovered During

Code review of PR #2474 (decompose scanner.py, Issue #2364)

Fix

Find the original issue number or remove the placeholder comment.

Impact

Severity: low -- Comment-only, no runtime impact.

[mrveiss]

Merged in PR #2525. Replaced placeholder Issue #XXX with correct #2364.