Part of epic #3602.

Scope

Add a commented-out [[llm.providers]] template for the GonkaGate gateway to config/default.toml so users discover the option when reading the file.

Files to modify

• config/default.toml:117 — append after the existing compatible-provider example:

  # GonkaGate — OpenAI-compatible decentralized inference gateway (USD billing).
  # Sign up at https://gonkagate.com/en/register, create an API key, then:
  #   zeph vault set ZEPH_COMPATIBLE_GONKAGATE_API_KEY gp-...
  # [[llm.providers]]
  # name = \"gonkagate\"
  # type = \"compatible\"
  # base_url = \"https://api.gonkagate.com/v1\"
  # model = \"Qwen/Qwen3-235B-A22B-Instruct-2507-FP8\"
  # max_tokens = 4096

• Update specs/003-llm-providers/spec.md implementations table with a new row Gonka (gateway).

Acceptance

• fy validate config/default.toml — well-formed TOML.
• cargo nextest run -p zeph-config --features full -- providers — tests parse the file without warnings.
• Spec table renders correctly.
• CHANGELOG.md [Unreleased] updated.

Depends on

None.

Size

S (~1h)