PluginContext.register_platform is last-writer-wins, so a user plugin could re-register 'telegram'
with trusted_inbound=True and every sender would skip the allowlist and pairing. The flag is now
refused for a platform core ships (a static Platform member or a bundled plugins/platforms/ plugin)
unless the registering plugin is bundled. Home Assistant is no longer either, so its catalog plugin
keeps it. `hermes plugins validate` prints a line for every trusted_inbound platform (and fails one
naming a core platform).
Also: the MCP collision test docstring no longer refers to the toolset it used to collide with.
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