feat: Add Obsidian vault configuration and documentation for navigation and memory management

.opencode/skills/index.md

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+# OpenCode Skills Index
+
+Skills available to the workspace agent.
+
+---
+
+## Generic Skills
+
+- [Workspace Memory Curation](workspace-memory-curation/SKILL.md)
+- [Professional Communication](professional-communication/SKILL.md)
+- [Status Reporting](status-reporting/SKILL.md)
+- [AI Prompt Engineering](ai-prompt-engineering/SKILL.md)
+
+---
+
+## Fidelity / iOS Skills
+
+- [Copilot Prompt Engineering](copilot-prompt-engineering/SKILL.md)
+- [iOS Swift Answering](ios-swift-answering/SKILL.md)
+- [iOS Testing Strategy](ios-testing-strategy/SKILL.md)
+- [SwiftUI XFlow Review](swiftui-xflow-review/SKILL.md)
+
+---
+
+## Related
+
+- [Tooling Map](../../knowledge/maps/tooling.md)
+- [Commands Index](../commands/index.md)
+- [Prompts Index](../../prompts/index.md)
+