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

ai/AGENTS.md

@@ -64,6 +64,8 @@ When drafting messages for a manager or stakeholder:
 
 - Treat workspace files as persistent memory, not just reference notes
 - Treat `core/` as project-independent workspace logic and keep Fidelity-specific facts in profile/context files
+- Treat Obsidian as an optional navigation layer over the same Markdown files, not as a separate source of truth
+- Do not treat `.obsidian/workspace*.json`, plugin caches, or local Obsidian layout changes as project memory
 - Prefer generic `AIW_*` integration variables for new tooling while preserving `FIDELITY_*` fallbacks for compatibility
 - Before answering prompts about current work, verify `ai/state/current.md` and the latest relevant log in `ai/logs/`
 - Before answering architecture, process, or historical questions, check the relevant file under `ai/context/systems/`, `ai/context/workstreams/`, or `ai/context/process/`

ai/logs/index.md

@@ -0,0 +1,27 @@
+# Logs Index
+
+Daily logs capture evolving evidence and same-day work context.
+
+Promote durable facts into `ai/state/`, `ai/work-items/`, or `ai/context/` when they should survive beyond the day.
+
+---
+
+## Logs
+
+- [2026-04-08](2026-04-08.md)
+- [2026-04-09](2026-04-09.md)
+- [2026-04-10](2026-04-10.md)
+- [2026-04-13](2026-04-13.md)
+- [2026-04-14](2026-04-14.md)
+- [2026-04-15](2026-04-15.md)
+- [2026-04-16](2026-04-16.md)
+
+---
+
+## Related Memory
+
+- [Current Work](../state/current.md)
+- [Work Item State](../state/work-items.md)
+- [Work Item Index](../work-items/index.md)
+- [Context Index](../context/index.md)
+