Add remote HF Space support to CLI

[abidlabs]

Summary

• Add --space flag to all list and get CLI commands, allowing users to query a remote HF Space by ID (user/space) or URL (https://user-space.hf.space)
• Add --hf-token flag for private Space access
• Add trackio/remote_client.py — thin wrapper around gradio_client.Client with error handling
• Add 4 missing read API endpoints to the Gradio UI (get_system_metrics_for_run, get_system_logs, get_snapshot, get_logs) and extend get_metric_values with optional filtering params
• Update CLI docs (docs/source/cli_commands.md) and agent skills (.agents/skills/trackio/) with remote Space usage
• Add e2e test (tests/e2e-spaces/test_cli_remote.py)

Examples:

List projects on a remote Space

$ trackio list projects --space abidlabs/nanogpt-experiments

Projects
========
  nanogpt
  gpt2-finetune

List runs (JSON output)

$ trackio list runs --project nanogpt --space abidlabs/nanogpt-experiments --json
{"project": "nanogpt", "runs": ["run-1", "run-2", "run-3"]}

Get metric values

$ trackio get metric --project nanogpt --run run-1 --metric loss --space abidlabs/nanogpt-experiments

Step   Timestamp                  Value
-----  -------------------------  -----
0      2025-06-01T12:00:00        0.5
1      2025-06-01T12:00:05        0.42
2      2025-06-01T12:00:10        0.35

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
🦄	Changes	detected!	Details

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
trackio	minor

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• Add remote HF Space support to CLI

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[abidlabs]

Going to merge this in as it's just CLI changes