docs(skills): update typed OpenTelemetry guidance

[willkill07]

Overview

Updates the public observability skills for the typed OpenTelemetry endpoint model introduced by #556. This follow-up is intentionally isolated from the breaking implementation and should merge after #556.

• I confirm this contribution is my own work, or I have the right to submit it under this project's license.
• I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

• Reframes the observability skill around typed OpenTelemetry projections: full, gen_ai, and openinference.
• Replaces standalone OpenInference configuration and subscriber guidance with OpenTelemetryConfig, OpenTelemetrySubscriber, and type = "openinference".
• Documents fixed projection behavior, deterministic Relay-derived trace and span IDs, exporter-owned gRPC runtime behavior, and per-endpoint header_env secret injection.
• Updates observability eval expectations and troubleshooting guidance for the unified endpoint model.
• Bumps public ATOF and CLI skill examples to observability configuration version 3.
• Aligns the skills index, skill card, debug guidance, and projection references with the breaking API and configuration changes in feat(observability)!: unify OpenTelemetry exporters #556.

Where should the reviewer start?

Start with skills/nemo-relay-plugin-observability/SKILL.md, then review skills/nemo-relay-plugin-observability/references/opentelemetry.md and skills/nemo-relay-plugin-observability/references/openinference.md for the updated public workflow and projection-specific guidance.

Validation performed on commit f02e7abf:

git diff --check
uv run pre-commit run --files <nine changed skills files>

All targeted hooks passed, including JSON validation and documentation link checking.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Relates to: feat(observability)!: unify OpenTelemetry exporters #556

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