API surface mapped against the SP22 stub at
ScriptLib/Stubs/scriptengine/ScriptSymbolConfigObject.pyi and the
docs at helpme-codesys.com/en/ScriptingEngine/ScriptSymbolConfigObject.html.
Phases 0-7 with file lists, per-tool args, enum mapping, idempotency
expectations, risks (esp. SymbolAccess enum values needing a one-shot
probe before lock-in), and verification plan against MCPTest2 then
X33.
Out-of-scope notes: no build_symbol_config tool (the API doesn't have
one; compile_project's application.build() emits the symbol XML as a
side effect), no comms-settings tab, no viz symbol lists.
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