Make PM workers own plugin publication and recovery
Replace member and publication callbacks with concrete selection/staged-tree requests. Discover under the install lock, validate staged identities, preserve YAML 1.1 semantics, reject stale config and concurrent inputs, and journal code/config/metadata before selecting facts. Keep boot recovery stdlib-only and preserve inactive/code-only publication.
Fix missing-but-enabled target discovery and propagate explicit install intent into Venv tool acquisition. Migrate memory-provider candidates to concrete additional directory inputs. Preserve progress/cancellation and existing updater compatibility surfaces.
Verification: focused baseline 64 passing tests; final 32-file run 282 passed, 0 failed. Real PM-only workers, local wheels/projects, competing edits, exact rollback, and 16 process-death publication boundary cases exercised.
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