P1.5 consumer compatibility gate before P2 element-tool v1 builders.
resolveNodeForCanvas was already resolving gap/padding/opacity/color refs,
but missed text typography fields (fontSize, lineHeight, letterSpacing) and
cornerRadius. Since both skia-engine and pen-renderer consume resolver output
before layout runs, unresolved string refs would pass arithmetic as NaN.
layout/engine.ts also patched to guard typeof === 'number' at the 4 text
font-size/line-height access points — defensive fallback to 16/1.x even when
called on pre-resolution nodes (e.g. MCP server, normalizer pipeline).
Adds 21-test p1-5-consumer-compat.test.ts covering all 6 consumer paths.
All 1183 pen-core tests pass. format:check and tsc --noEmit clean.
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