Add layered MergePipeline for multi-source entity discovery#246

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bburda wants to merge 6 commits intomainfrom

feature/merge-pipeline

Commits on Mar 5, 2026

feat(discovery): add layered MergePipeline with field-group merge
bburda
committed
feat(discovery): add ManifestLayer, RuntimeLayer, and PluginLayer
bburda
committed
feat(discovery): add post-merge RuntimeLinker and wire into HybridDiscoveryStrategy
bburda
committed
feat(discovery): add plugin integration, config, and /health reporting
bburda
committed
test(plugins): add vendor extension demo and integration test
bburda
committed
fix(build): enable POSITION_INDEPENDENT_CODE for MODULE targets
bburda
committed