feat(build): core build action overrides + workflow forwards RFC controls
- cmd_build.go + cmd_project.go: core build accepts action-style overrides
for build name, tags, obfuscate, NSIS, Deno frontend command, WebView2 mode,
build-cache enable
- --build-cache without explicit cache config seeds default cache layout
(.core/cache, cache/go-build, cache/go-mod) before builder setup
- release.yml: generated workflow exposes + forwards RFC controls so CI can
use them without editing .core/build.yaml
- Tests across cmd_project, cmd_workflow, workflow
Verified: go test ./... passes
Co-Authored-By: Virgil <virgil@lethean.io>
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