Add foundational documentation templates to support product design and architecture planning, including ADR, archetypes, LLM systems, dev setup, and shared modules.

docs/adr/0000-template.md

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+# ADR-0000: <Decision Title>
+
+---
+**Status:** proposed | accepted | superseded | rejected  
+**Date:** YYYY-MM-DD  
+**Owners:** <names/roles>  
+**Related:** <links to other ADRs / docs>  
+---
+
+## Context
+What problem are we solving?  
+What constraints matter (scale, compliance, team, timeline, cost)?
+
+## Decision
+State the decision clearly and specifically.
+
+## Alternatives Considered
+List viable alternatives with short pros/cons.
+
+## Consequences
+### Positive
+- …
+
+### Negative / Risks
+- …
+
+## Migration / Rollback Plan
+If we change our mind later, how do we move safely?
+
+## References
+- Links to relevant docs, benchmarks, vendor docs, or prototypes.
+