chore: normalize repo structure for terminal-first SwiftPM workflow

[sebastienrousseau]

Summary

• reorganizes automation into a task-based scripts taxonomy
• normalizes repository naming and paths for consistency
• aligns tests, docs, governance, and CI references to the new layout
• keeps workflow terminal-first (SwiftPM + shell), with no Xcode GUI project
  files

Key Changes

• scripts moved to:
  • scripts/bootstrap
  • scripts/git
  • scripts/quality
  • scripts/security
  • scripts/release
• Makefile, hooks, and workflows updated to new script paths
• tests normalized:
  • tests/core-tests
  • tests/ui-tests
• docs simplified and runtime-first
• governance filenames normalized to lowercase kebab-case where applicable

Validation

• make hygiene
• make security
• swift test

Notes

• commits are signed (git commit -S)
• branch: feat/v0.0.3

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