docs: add agentic payments docs#1981

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stepskop wants to merge 15 commits intomasterfrom

docs/agentic-payments

Commits on Oct 6, 2025

Commits on Oct 8, 2025

docs: extend openapi docs
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Commits on Oct 9, 2025

Commits on Nov 3, 2025

chore: add experimental callout
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Commits on Nov 4, 2025

fix: grammar
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Commits on Nov 19, 2025

chore: change the configuration example
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