DX-596-together-gpu-clusters: sync with mintlify-docs#1206

[zainhas]

Syncs the together-gpu-clusters skill with togethercomputer/mintlify-docs#1206 ("docs: document passive health check signals and repair actions", merged into main at c32d309e).

Triggering docs changes

• docs/health-checks.mdx — expands Passive Health Checks "Detected failure modes" from 3 unnamed categories to 20 named Prometheus-style signals across 4 groups (GPU/accelerator, InfiniBand, node OS/kernel/resources, scheduler).
• docs/node-repair.mdx — expands "Recommended repair actions" to map each passive signal to its repair action; introduces three actions (Reboot, Quick Reprovision, Migrate to New Host) plus a Warning tier. (Cross-referenced by health-checks.mdx; not a sync-map trigger by itself.)

Skill changes (references/cluster-management.md)

• Add Passive Health Checks subsection listing 20 named signals across GPU/accelerator (6), InfiniBand (2), Node OS/kernel/resources (10), and Scheduler (1), with typical-cause descriptions.
• Rewrite Node Repair to cover the three repair actions in escalation order (Reboot -> Quick Reprovision -> Migrate to New Host) plus a Warning-only tier, and note that lighter actions escalate if they don't clear the issue.
• Add Signal to recommended action mapping table (all 19 signals with automated actions; Xid 79 is called out as the special case that migrates instead of rebooting).
• Update the repair lifecycle line to include Reboot alongside Reprovision/Migrate.

No changes to SKILL.md, scripts, or other reference files — the existing Health Checks section on cluster-management.md already had the right home for this content.

Note: the previous auth-blocked backlog entry for mintlify-docs#952 skipped passive checks as "no API surface," but the current docs now surface named signals plus an explicit signal-to-action mapping, which is concrete operational content an agent needs when helping users interpret repair recommendations.

Generated by the Sync Skills Cursor Automation. Please review before merging.

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