feat: Organize context files and enhance documentation for clarity and structure

ai/context/process/context-maintenance.md

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+# Context Maintenance
+
+## Goal
+
+Keep this workspace useful as living memory instead of a pile of disconnected notes.
+
+---
+
+## Stable Rules
+
+- Update canonical context when a durable fact changes.
+- Prefer correcting stale context over appending contradictory notes.
+- Use the smallest correct destination:
+  - `ai/logs/YYYY-MM-DD.md` for daily progress and evolving findings
+  - `ai/state/current.md` for near-term active work
+  - `ai/state/work-items.md` for Jira-linked active work
+  - `ai/context/` for durable project knowledge
+  - `ai/context/people/` for named person context
+
+---
+
+## Ingestion Rules
+
+- Treat Mattermost, Slack history, and direct prompts as potential memory sources.
+- Do not promote failed syncs or tooling errors as project facts.
+- Promote repeated durable patterns from historical archives into stable context when confidence is high.
+- Keep old status-only details archive-only unless they still change current understanding.
+
+---
+
+## Curation Rule
+
+- If a new stable context file is added, keep `project.md` and `index.md` aligned so future sessions can discover it quickly.