[tool_extensibility] Prototype Phase 9: Dynamic plugin resolution and native registrant generation

Part of the tool extensibility prototype effort.

Support custom platform plugins and build registrant hooks in the prototype:

CustomPlatformPlugin parsing for unknown platform keys in plugin pubspec.yaml.
Host-side platform matching (resolvePluginImplementationsForPlatform).
Native CMake registrant injection and symlink generation hooks.

[flutter_tools] Simplify ExtensionArtifactManager stamp verification …

[flutter_tools] Rename downloadArtifacts to listRequiredArtifacts and…

[flutter_tools] Resolve native assets config dynamically per build co…

[flutter_tools] Add HostPlatform, ArtifactDependency, and ArtifactSer…

[flutter_tools] Derive CpuArchExtension names from instances

[flutter_tools] Gate custom plugin parsing and refine hooks interop

[flutter_tools] Support default hooks config and canonical compiler URIs

[flutter_tools] Move CpuArch to flutter_tools_core and define HostPla…

[flutter_tools] Add executable extension artifacts and device wiring

[flutter_tools] Wire assemble stampUri tracking and simplify artifact…

[flutter_tools] Harden extension plugins and Dart hooks interop

Navigation Menu