chore(docs): consolidate agent docs to single source of truth

- Delete legacy .cursorrules, .windsurfrules, .clinerules, CLAUDE.md
  (content duplicated AGENTS.md; replaced by canonical pointer architecture)
- Rewrite .github/copilot-instructions.md as thin pointer to AGENTS.md
  and the canonical agent-behavior-guidelines.md
- Prepend canonical 'Read first' pointer block to AGENTS.md
- Regenerate .editorconfig and .aider.conf.yml

Canonical source: learning_ai_common_plat/AI.dev/SKILLS/agent-behavior-guidelines.md
Managed by: learning_ai_common_plat/scripts/update-agent-docs.sh

.aider.conf.yml

@@ -1,5 +1,6 @@
 # .aider.conf.yml — Aider Configuration for ByteLyst Agentic Notes
-# Helps Aider understand the project structure and conventions.
+# Auto-generated by learning_ai_common_plat/scripts/update-agent-docs.sh
+# Hand-edit will be overwritten on next run.
 
 read:
   - AGENTS.md

.clinerules

@@ -1,22 +0,0 @@
-# .clinerules — Cline / Roo Code Rules for ByteLyst Agentic Notes
-# Read AGENTS.md for the complete onboarding guide.
-
-## Project: ByteLyst Agentic Notes — Agentic note-taking workspace for notes, tasks, relationships, and workspaces
-Architecture: Docs + Fastify 5 backend scaffold with TypeScript ESM and @bytelyst/* shared packages
-
-## Mandatory Rules
-- Backend follows the ByteLyst product-backend pattern with Fastify 5 + TypeScript ESM
-- Use @bytelyst/* shared packages instead of reimplementing common infrastructure
-- Fastify modules follow types.ts → repository.ts → routes.ts
-- Use req.log / app.log — never console.log
-- Every Cosmos document MUST include productId: "bytelyst-notes"
-- Keep docs aligned with implementation as the repo evolves from scaffold to product
-- Commits: `type(scope): description`
-- After changes, verify: `cd backend && npm test && npm run typecheck && npm run build`
-
-## Key File Locations
-- docs/ — PRD, roadmap, and planning docs
-- backend/ — Fastify 5 + TypeScript ESM backend scaffold (port 4016)
-- backend/src/modules/ — notes, workspaces, note-relationships, note-tasks
-- backend/src/lib/ — shared backend wiring and utilities
-- Full guide: `AGENTS.md`

.cursorrules

@@ -1,30 +0,0 @@
-# ByteLyst Agentic Notes — Cursor Rules
-# Read AGENTS.md for full context.
-
-Project: ByteLyst Agentic Notes — Agentic note-taking workspace for notes, tasks, relationships, and workspaces
-Product ID: bytelyst-notes
-Stack: Docs + Fastify 5 backend scaffold with TypeScript ESM and @bytelyst/* shared packages
-
-## Architecture
-- docs/ — PRD, roadmap, and planning docs
-- backend/ — Fastify 5 + TypeScript ESM backend scaffold (port 4016)
-- backend/src/modules/ — notes, workspaces, note-relationships, note-tasks
-- backend/src/lib/ — shared backend wiring and utilities
-
-## Rules
-- Backend follows the ByteLyst product-backend pattern with Fastify 5 + TypeScript ESM
-- Use @bytelyst/* shared packages instead of reimplementing common infrastructure
-- Fastify modules follow types.ts → repository.ts → routes.ts
-- Use req.log / app.log — never console.log
-- Every Cosmos document MUST include productId: "bytelyst-notes"
-- Keep docs aligned with implementation as the repo evolves from scaffold to product
-- Commits: feat(scope): description / fix(scope): description
-- Never delete existing comments/documentation unless asked
-- Never add emojis unless asked
-- Never hardcode secrets, colors, or API URLs
-
-## Build Verification
-- cd backend && npm test && npm run typecheck && npm run build
-
-## Key Documents
-- AGENTS.md — Full AI agent instructions (read this first)

.github/copilot-instructions.md

@@ -1,38 +1,24 @@
-# GitHub Copilot Instructions — NoteLett
+<!-- AUTO-GENERATED by learning_ai_common_plat/scripts/update-agent-docs.sh -->
+<!-- DO NOT EDIT. Edit the canonical sources instead. -->
 
-> For full agent instructions, read [`AGENTS.md`](../AGENTS.md) at the repo root.
+# GitHub Copilot Instructions — ByteLyst Agentic Notes
 
-## Project Context
+**Project:** ByteLyst Agentic Notes — `bytelyst-notes`
+**Stack:** Docs + Fastify 5 backend scaffold with TypeScript ESM and @bytelyst/* shared packages
 
-**NoteLett** — structured notes platform for humans and AI agents.
-Stack: Fastify 5 + TypeScript ESM backend, Next.js web, Expo mobile, and @bytelyst/* shared packages
+## Read these (in order) before suggesting code
 
-## Code Generation Rules
+1. **`AGENTS.md`** at the repo root — repo-specific layout, conventions,
+   build commands, file ownership.
+2. **`../learning_ai_common_plat/AI.dev/SKILLS/agent-behavior-guidelines.md`** —
+   ecosystem-wide agent behavior rules (Karpathy + ByteLyst). Identical
+   across every repo in the workspace.
 
-### Always
-- Backend follows the ByteLyst product-backend pattern with Fastify 5 + TypeScript ESM
-- Use @bytelyst/* shared packages instead of reimplementing common infrastructure
-- Fastify modules follow types.ts → repository.ts → routes.ts
-- Use req.log / app.log — never console.log
-- Every Cosmos document MUST include productId: "notelett"
-- Keep docs aligned with implementation as the repo evolves from scaffold to product
-- Include `productId: "notelett"` in every Cosmos DB document
-- Use `type(scope): description` commit message format
-- Fix source code, not tests (unless the test itself is wrong)
+Both files together are the complete contract. This pointer file contains
+no rules of its own to avoid duplication and drift.
 
-### Never
-- `console.log` or `print()` in production code
-- Hardcoded secrets, API keys, colors, or URLs
-- Delete existing comments or documentation unless explicitly asked
-- Add emojis unless asked
+## Quick verification command
 
-## Key Paths
-- docs/ — PRD, roadmap, and planning docs
-- backend/ — Fastify 5 + TypeScript ESM backend (port 4016)
-- backend/src/modules/ — notes, workspaces, relationships, tasks, artifacts, reviews, prompts, intake, palace, and sharing
-- backend/src/lib/ — shared backend wiring and utilities
-
-## Build Verification
 ```bash
-pnpm run verify
+cd backend && npm test && npm run typecheck && npm run build
 ```

.windsurfrules

@@ -1,23 +0,0 @@
-# ByteLyst Agentic Notes — Windsurf / Codeium Rules
-# Read AGENTS.md for full context. These are the critical rules.
-
-Project: ByteLyst Agentic Notes — Agentic note-taking workspace for notes, tasks, relationships, and workspaces
-Stack: Docs + Fastify 5 backend scaffold with TypeScript ESM and @bytelyst/* shared packages
-
-## Architecture Rules
-- docs/ — PRD, roadmap, and planning docs
-- backend/ — Fastify 5 + TypeScript ESM backend scaffold (port 4016)
-- backend/src/modules/ — notes, workspaces, note-relationships, note-tasks
-- backend/src/lib/ — shared backend wiring and utilities
-
-## Conventions
-- Backend follows the ByteLyst product-backend pattern with Fastify 5 + TypeScript ESM
-- Use @bytelyst/* shared packages instead of reimplementing common infrastructure
-- Fastify modules follow types.ts → repository.ts → routes.ts
-- Use req.log / app.log — never console.log
-- Every Cosmos document MUST include productId: "bytelyst-notes"
-- Keep docs aligned with implementation as the repo evolves from scaffold to product
-- Commits: feat(scope): description / fix(scope): description
-
-## Build Verification
-- cd backend && npm test && npm run typecheck && npm run build

AGENTS.md

@@ -1,5 +1,17 @@
 # AGENTS.md — AI Coding Agent Instructions
 
+<!-- BEGIN: canonical-behavior-pointer (auto-managed) -->
+> **Read first (ecosystem-wide agent behavior):**
+> [`../learning_ai_common_plat/AI.dev/SKILLS/agent-behavior-guidelines.md`](../learning_ai_common_plat/AI.dev/SKILLS/agent-behavior-guidelines.md)
+>
+> The link above is the single source of truth for agent behavior across every
+> ByteLyst repo (Karpathy + ByteLyst rules: tests sacred, verify before done,
+> no shared-infra hand-edits, no `console.log`/`print`, productId on every
+> Cosmos doc, conventional commits, style preservation).
+>
+> The per-repo content below extends — never duplicates — the canonical rules.
+<!-- END: canonical-behavior-pointer -->
+
 > **For:** Claude Code, OpenAI Codex, Cursor, GitHub Copilot, Windsurf Cascade, and any AI coding agent.
 > **Repo:** `learning_ai_notes` — NoteLett structured notes platform for humans and AI agents.
 > **See also:** [`docs/PRD.md`](docs/PRD.md) for full product spec, [`docs/ROADMAP.md`](docs/ROADMAP.md) for implementation status, [`docs/PRODUCTION_READINESS_HANDOFF_ROADMAP.md`](docs/PRODUCTION_READINESS_HANDOFF_ROADMAP.md) for the production-readiness checklist, and [`docs/UI_UX_PLATFORM_CORE_ROADMAP.md`](docs/UI_UX_PLATFORM_CORE_ROADMAP.md) for UI/UX platform-core migration.

CLAUDE.md

@@ -1,40 +0,0 @@
-# ByteLyst Agentic Notes — Claude Code Instructions
-
-> This file is read automatically by Claude Code. For full agent instructions
-> shared across all AI tools, see [`AGENTS.md`](AGENTS.md).
-
-## Quick Context
-
-**Product:** ByteLyst Agentic Notes — Agentic note-taking workspace for notes, tasks, relationships, and workspaces
-**Product ID:** `bytelyst-notes`
-**Stack:** Docs + Fastify 5 backend scaffold with TypeScript ESM and @bytelyst/* shared packages
-
-## Rules
-
-1. **Read `AGENTS.md` first** — it has coding conventions, file ownership, and tech stack rules.
-2. **Every Cosmos document** must have a `productId: "bytelyst-notes"` field.
-3. **Commit messages:** `type(scope): description` (feat, fix, docs, refactor, test, chore).
-4. **Fix source, not tests** — unless the test itself is wrong.
-5. **Never use** `console.log`, `print()`, or hardcoded colors/secrets/URLs.
-
-## Architecture
-
-- docs/ — PRD, roadmap, and planning docs
-- backend/ — Fastify 5 + TypeScript ESM backend scaffold (port 4016)
-- backend/src/modules/ — notes, workspaces, note-relationships, note-tasks
-- backend/src/lib/ — shared backend wiring and utilities
-
-## Build Verification
-
-```bash
-pnpm --filter @notelett/backend run test
-pnpm --filter @notelett/backend run typecheck
-pnpm --filter @notelett/backend run build
-```
-
-
----
-
-## Cross-Repo Automation
-
-See [`../learning_ai_common_plat/docs/devops/CODING_AGENT_AUTOMATION_PLAYBOOK.md`](../learning_ai_common_plat/docs/devops/CODING_AGENT_AUTOMATION_PLAYBOOK.md) for periodic maintenance tasks: test audits, coverage gaps, dependency checks, secret scans, typecheck sweeps.