docs: ADR-0005 module package format

[mrbrandao]

Summary

• Add ADR-0005 documenting the module packaging model: lola.mod + lola.sum pair (mirroring Go's go.mod + go.sum), OCI module artifact type (application/vnd.lola.module.v1), and tarball distribution
• Add paired design doc with format specs, dependency flow Mermaid diagram, OCI layer structure diagram, and .lola-req backwards compatibility

Related Issues

• Relates to feat: skill signature verification at mod add time (sigstore MVP) #84 (sigstore MVP — this ADR defines what gets signed)
• Part of the Lola Go migration and extension platform architecture initiative

Test Plan

• ADR follows the project template format
• Design doc Mermaid diagrams render correctly
• lola.mod format is consistent with existing .lola-req syntax

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Reviewing files that changed from the base of the PR and between a343c6e and fd25c7e.

📒 Files selected for processing (2)

• docs/adr/0005-module-package-format.md
• docs/dev-guide/design/module-package-format.md

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