A bundled platform whose plugin.yaml `name:` differs from its directory
(dir `a2a`, name `a2a-platform`) could be enabled under the manifest name
— `plugins enable` writes that key and `gate_manifest` matches it — but
`Platform._missing_` only knew directory names, so `platforms.a2a-platform:`
in config.yaml raised inside `GatewayConfig.from_dict` and was silently
dropped: the gateway booted without the platform and its port never bound.
`_scan_bundled_plugin_platforms` now also collects each manifest `name:`
as an alias mapped to its directory, and `_missing_` resolves such an
alias to the directory-name member, so every consumer (registry lookup,
adapter creation, config round-trips) sees the canonical value and the
identity invariant holds for both spellings. Aliases never shadow a
directory name.
Fixes#116180
7427f53921