fix(ts-sdk): apply license config to publish output mode in package.json

[Ryan-Amirthan]

Description

Fixes the license field being missing from generated package.json when using the publish output mode. The license configuration from generators.yml was only applied for the github output mode; the publish case hardcoded license: undefined.

Changes Made

• constructNpmPackage.ts: Use licenseFromLicenseConfig(generatorConfig.license) in the "publish" output mode case instead of hardcoding undefined
• constructNpmPackage.ts: Refactor the "github" case to also use the shared licenseFromLicenseConfig helper instead of an inline _visit call (same behavior, reduces duplication)
• Added versions.yml entry for 3.63.4

Review Checklist

• Verify licenseFromLicenseConfig (lines 113-119 of the file) handles the same basic/custom/_other cases as the removed inline _visit in the github branch
• Confirm no behavioral change to the downloadFiles case (returns undefined early, untouched)

Testing

• Manual testing completed — lint passes (pnpm run check)
• No unit tests added; this is a one-line plumbing fix using an existing helper that was already tested via the constructNpmPackageFromArgs path

Link to Devin session: https://app.devin.ai/sessions/0c24018e60484ac0b7cead2b0c91d1fc
Requested by: @Ryan-Amirthan

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SDK Generation Benchmark Results

Comparing PR branch against latest nightly baseline on main (2026-04-10T04:56:48Z).

Full benchmark table (click to expand)

Generator	Spec	main (generator)	main (E2E)	PR (generator)	Delta
ts-sdk	square	102s	129s	97s	-5s (-4.9%)

main (generator): generator-only time via --skip-scripts (includes Docker image build, container startup, IR parsing, and code generation — this is the same Docker-based flow customers use via fern generate). main (E2E): full customer-observable time including build/test scripts (nightly baseline, informational). Delta is computed against generator-only baseline.
⚠️ = generation exited with a non-zero exit code (timing may not reflect a successful run).
Baseline from nightly runs on main (latest: 2026-04-10T04:56:48Z). Trigger benchmark-baseline to refresh.