docs: add archive README for 000-initial-config

specs/000-initial-config/README.md

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+# 000-initial-config (ARCHIVED)
+
+This folder is a **legacy archive** of early v1 specifications copied from older `.specify/*` artifacts.
+
+## Rules
+
+- **Do not use this folder for active work.**
+- Active feature specs must live under `specs/<NNN>-<slug>/`.
+- Active work must happen on `feat/<NNN>-<slug>` branches.
+
+## What is in here?
+
+- `spec.md`: archived feature specification
+- `plan.md`: archived implementation plan
+- `tasks.md`: archived task list
+- `research_t186.md`: archived research note
+
+If you want to revive any of this as a new feature, create a new `specs/<NNN>-<slug>/` folder and copy only the relevant parts.