setup-vcpkg v2.4: anchor cache-key hash to consumer manifest (#97)

setup-vcpkg: resolve runner image version for binary-cache key

Fixes the dead env.ImageVersion key segment so the vcpkg binary cache rotates
on runner-image/ABI bumps instead of permanently rebuilding from source.

chore(deps): update github-actions (#78)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

chore(deps): update github-actions (#78)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

setup-vcpkg: image-aware binary-cache key (+ cache-write toggle from …

…v2.1)

v2.1: setup-vcpkg cache-write toggle (backward-compatible; default re…

…adwrite unchanged)

fix(docs): use npm for VitePress build check (#59)

pnpm 10+ gates dependency build scripts behind an allowlist whose setting
keeps being renamed (onlyBuiltDependencies -> allowBuilds in v11), which
repeatedly broke esbuild's postinstall in this throwaway scaffold. npm runs
build scripts by default — immune to pnpm version churn. Validated: vitepress
build completes and emits dist.

feat: add metrics.json synthesis and workflow_call outputs to metrics…

….yml