Enhance HW reset recovery logic and streaming state management

[Nikolai-L]

• Implement a lightweight stability probe during HW reset recovery to ensure natural recovery before full verification.
• Modify ds5_mux_s_stream() to enforce a stop on streaming if reset-generation invalidation is detected, ensuring proper reconfiguration.

[Copilot]

Pull request overview

This PR tightens post-HW-reset recovery behavior in the D4XX kernel driver by adding a lightweight “natural recovery” stability probe before running the full I2C stability loop, and by making stream start more robust when cached state is invalidated by a reset-generation bump.

Changes:

• Add a lightweight Step-10 stability probe on the natural-recovery path; if it fails, trigger Phase 1 SERDES recovery and then run full stability verification.
• Update ds5_mux_s_stream() to avoid treating “already streaming” as a no-op when a reset-generation invalidation was detected; force-stop and clear state to ensure a clean reconfigure.
• Document these behavioral rules in repo guidance files.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
kernel/realsense/d4xx.c	Adds natural-recovery stability gating to HW reset Step 10 and strengthens streaming state handling after reset-generation invalidation.
CLAUDE.md	Documents the new Step 10 natural-recovery gate and the updated ds5_mux_s_stream() rule.
.github/copilot-instructions.md	Codifies the same reset/streaming behavior expectations for future changes.

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