feat: add shared workflow and skill references in .agents and update GEMINI.md for clarity on workspace structure

.agents/skills/ai-prompt-engineering/SKILL.md

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+../../rules/ai-prompt-engineering.md

.agents/skills/copilot-prompt-engineering/SKILL.md

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+../../rules/copilot-prompt-engineering.md

.agents/skills/ios-swift-answering/SKILL.md

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+../../rules/ios-swift-answering.md

.agents/skills/ios-testing-strategy/SKILL.md

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+../../rules/ios-testing-strategy.md

.agents/skills/professional-communication/SKILL.md

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+../../rules/professional-communication.md

.agents/skills/status-reporting/SKILL.md

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+../../rules/status-reporting.md

.agents/skills/swiftui-xflow-review/SKILL.md

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+../../rules/swiftui-xflow-review.md

.agents/skills/workspace-memory-curation/SKILL.md

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+../../rules/workspace-memory-curation.md