Seed CDK context-provider lookups (e.g. SSM valueFromLookup) into the module's
cdk.context.json so synth resolves them from cache instead of recording "missing
context" entries that the diff toolkit rejects. CDK reads cdk.context.json from
the directory it runs in, discovered via --testing. Returns the seeded file path
(for later cleanup) or undefined when no seeding was needed.
Seed CDK context-provider lookups (e.g. SSM valueFromLookup) into the module's cdk.context.json so synth resolves them from cache instead of recording "missing context" entries that the diff toolkit rejects. CDK reads cdk.context.json from the directory it runs in, discovered via --testing. Returns the seeded file path (for later cleanup) or undefined when no seeding was needed.