docs: add minimal README.md stubs for modules to satisfy validator

client/README.md

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+# Client\n\nMinimal placeholder README. Client apps live under ./clients/. See docs/index.md for docs.

core/README.md

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+# Core\n\nMinimal placeholder README. See docs/index.md for project documentation.

events/README.md

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+# Events Module\n\nThis is a minimal placeholder README to satisfy documentation validation. See docs/index.md for project docs.

horses/README.md

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+# Horses Module\n\nThis is a minimal placeholder README to satisfy documentation validation. See docs/index.md for project docs.

infrastructure/README.md

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+# Infrastructure\n\nMinimal placeholder README. For infrastructure details, start at docs/index.md and docs/overview/system-overview.md.

masterdata/README.md

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+# Masterdata Module\n\nThis is a minimal placeholder README to satisfy documentation validation. See docs/index.md for project docs.

members/README.md

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+# Members Module\n\nThis is a minimal placeholder README to satisfy documentation validation. See docs/index.md for project docs.