fix(integrations): preserve Hermes registration ownership

[mikemikimike]

Summary

• avoid private PluginManager writes when Hermes provides command or skill registration APIs
• retain capability-gated fallback support for legacy collectors
• update the Hermes manifest and compatibility guidance for the lifecycle-aware collector

Testing

• Python 3.14 focused: 107 passed
• Python 3.12 Hermes suite: 269 passed, 12 skipped
• Hermes manifest validation, Ruff lint and format checks, and git diff --check passed

Notes

• just package-check-hermes could not run because just is not installed on this Windows environment; its underlying manifest and Python 3.12 unit-suite checks were run directly.
• ty check integrations/hermes still reports existing external-Hermes import and strict-annotation diagnostics.

Fixes #1257

[CLAassistant]

All committers have signed the CLA.