fix(hf-sync): default HF Space owner to picault, not the GitHub owner

[picaultj]

Problem

The Sync to Hugging Face Space workflow fails on every run:

Syncing to https://huggingface.co/spaces/picaultj/conflens
remote: Repository not found
fatal: repository 'https://huggingface.co/spaces/picaultj/conflens.git/' not found

HF_USERNAME defaulted to github.repository_owner (picaultj), but the Space is picault/conflens — the Hugging Face username differs from the GitHub owner. So it pushed to a non-existent picaultj/conflens.

Fix

• Default HF_USERNAME to picault (still overridable via the HF_USERNAME repo variable).
• Correct stale comments: the workflow header said "Create a Docker Space" and "defaults to the GitHub owner" — now "Gradio Space" and "picault", matching the current Gradio SDK deployment. README setup note updated too.

After this merges, the next push to main (or a manual Run workflow) will sync to picault/conflens.

Testing

• Workflow validated as well-formed YAML.
• Verified against the failing run log: the only error was the wrong owner in the push URL; auth/token and the rest of the workflow are fine.

Note: this assumes the HF_TOKEN secret belongs to picault with write access to that Space (it was created under that account). If the Space is actually a Docker Space, change it to Gradio (or recreate as Gradio → Blank) so it matches the repo's sdk: gradio metadata.

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[picaultj]

Closing: HF Gradio Spaces are no longer free, so the Hugging Face deployment (and this sync workflow) is being removed in #22. No longer needed.

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Generated by Claude Code