umputun / ralphex / 27366797976

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feat: add fable to supported agent model keywords

Anthropic released Fable (claude-fable-5), a tier above Opus. Agent
frontmatter validation accepted only haiku/sonnet/opus, so model: fable
(or a full ID like claude-fable-5) was dropped with a warning.

- pkg/config/frontmatter.go: add "fable" to validModels; update
  Validate warning and normalizeModel doc comment
- pkg/config/frontmatter_test.go: new cases for fable keyword
  validation and claude-fable-5 full-ID normalization; updated
  warning expectations
- pkg/config/defaults/config, values.go, executor.go: extend
  model enumerations in comments
- README.md, CLAUDE.md, llms.txt: document fable as an accepted
  agent model keyword and update examples

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