fix: prune bundled Jarvis runtime payloads

[artemgetmann]

Review Fast Path

• User path fixed: Jarvis public packages stop carrying avoidable bundled-runtime weight from duplicate pre-sign assets and dependency docs/tests/examples.
• Proof: bash scripts/test-macos-runtime-prune.sh; bash scripts/test-jarvis-release-size-report.sh; bash -n scripts/lib/macos-runtime-prune.sh scripts/package-mac-app.sh scripts/test-macos-runtime-prune.sh scripts/report-jarvis-release-size.sh scripts/test-jarvis-release-size-report.sh; git diff --check.
• Shared-state footgun removed: pruning happens only inside the staged app bundle after production dependencies are materialized; repo node_modules, lockfiles, source deps, Intel Node, Intel uv, and macOS native twins stay intact.
• Still hurts: stacked on chore: expand Jarvis size audit report #1094 until that report-tooling PR auto-merges; no full Jarvis app rebuild in this PR yet.

Why This Matters

• Current Jarvis update artifact is large: existing report measured Jarvis.zip at 465,595,234 bytes and Jarvis.app at 1,615,323,136 bytes.
• The safe first diet slice should remove generated/package auxiliary files, not reduce architecture coverage or runtime capability.

Scope Boundary

• Changes packaging only.
• Keeps Intel support.
• Keeps bundled Node x64, bundled uv x64, macOS native addon twins, skills, templates, and extension runtime code.
• Does not change notarization, Sparkle publication, release truth output, or runtime launch behavior.

Verification

• bash scripts/test-macos-runtime-prune.sh
• bash scripts/test-jarvis-release-size-report.sh
• bash -n scripts/lib/macos-runtime-prune.sh scripts/package-mac-app.sh scripts/test-macos-runtime-prune.sh scripts/report-jarvis-release-size.sh scripts/test-jarvis-release-size-report.sh
• git diff --check
• Real artifact assumption check: source dist/assets and dist/plugin-sdk/assets in the warmed release lane are byte-identical before signing; already-signed app copies differ, so this patch dedupes during future staging before signing.
• Real artifact estimate: node_modules docs/tests/examples/benchmarks under the current warmed Jarvis app account for about 35,454,976 bytes uncompressed.

AI Assistance

• AI-assisted
• Testing degree: targeted