feat(stats): add v1 immersion stats dashboard (#19)

docs/knowledge-base/core-beliefs.md

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+<!-- read_when: deciding how much context to inject, where docs should live, or how agents should navigate the repo -->
+
+# Core Beliefs
+
+Status: active  
+Last verified: 2026-03-13  
+Owner: Kyle Yasuda  
+Read when: making decisions about agent ergonomics, doc structure, or repository guidance
+
+## Agent-First Principles
+
+- Progressive disclosure beats giant injected context.
+- `AGENTS.md` should map the territory, not duplicate it.
+- Canonical internal guidance belongs in versioned docs near the code.
+- Plans are first-class while active work is happening.
+- Mechanical checks beat social convention when the boundary matters.
+- Small focused docs are easier to trust, update, and verify.
+- User-facing docs and internal operating docs should not blur together.
+
+## What This Means Here
+
+- Start from `AGENTS.md`, then move into `docs/`.
+- Prefer links to canonical docs over repeating long instructions.
+- Keep architecture and workflow docs in separate pages so updates stay targeted.
+- When a page becomes long or multi-purpose, split it.