feat(logging): standardize plugin registration receipts

[offendingcommit]

Summary

Hermes plugins can now emit one stable registration receipt from the shared kit, so operators can verify the exact tools, hooks, commands, middleware, and skills that loaded instead of trusting hand-maintained counts.

The helper records the manifest plugin name when available and keeps skipped optional skills observable without changing registration behavior.

Validation

• make test (71 passed)
• make build
• git diff --check

Post-Deploy Monitoring & Validation

• Search gateway logs for registered plugin= and confirm one receipt per migrated plugin load.
• Healthy: exact registered names match each plugin manifest and runtime configuration.
• Failure: import errors or missing/duplicate receipts. Roll back the consumer pin before restarting affected gateways.
• Window/owner: first gateway reload after consumer rollout, Jonathan.

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