fix(publish): move HF credentials path to ~/.config/huggingface/credentials

[shaypal5]

Moves the token fallback file from ~/.config/leadforge/credentials to ~/.config/huggingface/credentials, co-locating it with the rest of HuggingFace tooling config.

🤖 Generated with Claude Code

[github-actions]

pr-agent-context report:

No unresolved review comments, failing checks, or actionable patch coverage gaps were found on PR #92 in repository https://github.com/leadforge-dev/leadforge. Treat this PR as all clear unless new signals appear.

Run metadata:

Tool ref: v4
Tool version: 4.0.21
Trigger: pull request opened
Workflow run: 26620626495 attempt 1
Comment timestamp: 2026-05-29T05:50:20.477640+00:00
PR head commit: 9ba2f7e5a316f8546cf045b1c4f43459c22e7aa2

[Copilot]

Pull request overview

Relocates the fallback Hugging Face credentials file from ~/.config/leadforge/credentials to ~/.config/huggingface/credentials so the token storage sits alongside other HuggingFace tooling configuration.

Changes:

• Update _CREDENTIALS_FILE constant to the new HuggingFace-scoped path.
• Update the corresponding docstring in _read_token_from_credentials_file.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.