hasSdk was parsed in bin/install.js but never passed to
installSdkIfNeeded, so `npx get-shit-done-cc@latest --sdk` silently
skipped SDK deployment via the isLocal early-return and emitted a
misleading "✓ GSD SDK ready" message.
installSdkIfNeeded now accepts opts.forceSdk. When true (set from
hasSdk at the call site in installAllRuntimes), the local-install
soft-skip is bypassed so the full shim-link path runs regardless of
install mode. When dist is also missing with forceSdk=true, the
fail-fast diagnostic fires instead of silently returning.
The #2678 soft-skip (isLocal + missing dist + no --sdk) is preserved.
Closes#3033
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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