Promote Bash v0.3 design cases

[Aaronontheweb]

Promotes the remaining 21 stable Bash v0.3 design cases into the executable corpus and fills the parser facts those cases exposed.

Highlights:

• publishes sparse exact/unknown EffectiveArguments for policy-relevant Bash values
• preserves configured $HOME bytes and quote/escape/continuation provenance
• corrects Bash tilde-prefix handling without changing the public API
• reconciles unquoted wildcard redirect completeness across SPEC, OpenSpec, and the design corpus
• makes check-bash emit complete clause-element expectations

Validation:

• dotnet build -c Release
• dotnet test -c Release --no-build (2,612 passed)
• pwsh ./scripts/Add-FileHeaders.ps1 -Verify
• Slopwatch dirty-file analysis
• openspec validate v0-3-structured-shell-analysis --strict
• adversarial review PASS after Bash-oracle quote, escape, LF/CRLF continuation, tilde, trailing-home-separator, wildcard, and API-surface probes