Project and clone execution regions

[Aaronontheweb]

Summary

• project direct execution-region bodies without synthetic host occurrences
• project command-owned bodies after substitutions and their host, preserving authored region order
• enforce unique DynamicSkip host coordinates and fail atomically on malformed region structure
• count execution regions against the shared structural-depth limit
• preserve execution regions through Bash and PowerShell decoded-wrapper cloning
• extend executable-corpus DTO validation with all typed region facts

Security behavior

Unknown phase, timing, or cardinality makes both an attached host and its body incomplete. Invalid origins, host coordinates, duplicate coordinates, cycles, reused nodes, and depth overflow discard all partial Commands and Clauses.

Validation

• dotnet build -c Release --no-restore
• dotnet test -c Release --no-build: 1,925 passed
• focused projection, clone, and corpus tests: 30 passed
• pwsh ./scripts/Add-FileHeaders.ps1 -Verify
• openspec validate v0-3-structured-shell-analysis --strict
• slopwatch analyze --no-baseline --fail-on warning: 0 findings
• adversarial review of exact diff 8ee87ea6: GO, no blocking findings