feat: rebrand to Strange Days Tech + CLI scaffolder + repo restructure

[montfort]

Summary

• Rebrand all references from Enigmora to Strange Days Tech, S.A.S. across 53+ files (zero Enigmora references remaining)
• Create DEVTRAIL.md as single source of truth for governance rules, reducing CLAUDE.md/GEMINI.md/.cursorrules/copilot-instructions.md to lightweight references via <!-- devtrail:begin/end --> markers
• Build Rust CLI (cli/) with devtrail init, devtrail update, and devtrail remove commands that download releases from GitHub and inject directives into AI agent config files
• Add release pipeline (.github/workflows/release.yml) for cross-platform binary builds (Linux, macOS x86/ARM, Windows) and distribution ZIP packaging
• Restructure repo for distribution: add dist-manifest.yml, remove docs/ (GitHub Pages to be replanned), remove obsolete copy-devtrail.sh and old assets
• Update all documentation (README, ADOPTION-GUIDE, CONTRIBUTING, i18n/es/) with CLI installation instructions

Test plan

• grep -ri "enigmora" . returns zero results
• DEVTRAIL.md exists and contains all governance rules
• CLAUDE.md, GEMINI.md, .cursorrules are lightweight with markers
• dist-manifest.yml exists, docs/ removed, copy-devtrail.sh removed
• cargo build --release compiles successfully (cli/)
• cargo test — 10/10 tests pass
• .github/workflows/release.yml created with 3 jobs
• Manual review of rebranding accuracy in all files

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