docs: clarify memory bank status indicators

[Olusammytee]

Summary\n- clarify that Memory Bank status indicators may not appear in all clients\n- soften guarantees to align with observed behavior\n\n## Testing\n- not run (docs-only)\n\nCloses #3837

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Pull request overview

This PR addresses documentation confusion about Memory Bank status indicators by clarifying that they may not appear in all clients or modes, while the Memory Bank itself can still be active.

Changes:

• Softened language from definitive statements to conditional statements about status indicator appearance
• Added a new paragraph explicitly explaining that status indicators are not guaranteed and providing alternative verification methods