chore: bootstrap agent-ready docs, rules, spec and research

Adds AGENTS.md (clean-room and Bun rules), pointer files, agent permission
configs, docs tree, the STaurtomation design spec (draft) and sanitized
licensing/competitor research.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -0,0 +1,32 @@
+# Architecture
+
+How `STaurtomation` is built today. Update in the same commit as any structural change.
+
+## Overview
+No code exists yet. The target architecture is specified in `docs/specs/001-staurtomation.md` §4:
+one Bun process serving the React editor, the REST/WebSocket API, scheduler and workflow engine;
+separate language runners (Bun/TypeScript, Python first) that connect to the server over WebSocket,
+receive jobs and stream results back. Replace this section with reality as modules land.
+
+## Map
+| Path | Responsibility |
+|---|---|
+| `docs/specs/` | Permanent specs; `001-staurtomation.md` is the product design |
+| `docs/research/` | Sanitized licensing and competitor research (clean-room safe) |
+| `docs/plans/` | Transient implementation plans |
+
+## Data flow
+Planned (spec §4.4): trigger → server enqueues execution → runner executes nodes on lists of items
+→ per-node input/output persisted (subject to retention/redaction) → editor shows results.
+
+## External dependencies
+Planned: SQLite (single box) or PostgreSQL; optional Redis for HA; optional container runtime for
+isolated job execution; optional S3-compatible storage for binary data.
+
+## Invariants
+- No code from n8n, Kestra, Windmill or Activepieces; no dependency on their packages (spec §3.2).
+- No feature gated by edition, key, user count or payment.
+- Imports never silently drop nodes or data.
+
+## Known rough edges
+None yet — see `docs/TODO.md`.