v0.18.1-fork.1 Upstream stuffs

Copied from upstream

v0.18.1
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Docs

- 882914d: docs(readme): add initialize_as (#1438) (@Amolith)

Other Stuff

- 7af916b: chore: update fantasy & add support for gpt-5.1 (#1439)
  (@kujtimiihoxha)

v0.18.0
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New!

- 4e40b47: feat(config): default to AGENTS.md w/ new setting (#1403)
  (@Amolith)

Fixed

- c094eaf: fix(test): set a fixed attribution to avoid system prompt
  mismatch (@andreynering)
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