test: add an end-to-end acceptance flow

Stubs the single GraphQL chokepoint and drives the full integration path against a temp active file: run a saved query, render with the source header, read the source back, refresh the same source with an in-place merge, switch sources while the buffer is dirty (the edit is preserved, not clobbered), then from inside a rendered issue subtree sync an edited description, add a comment, and set priority. Everything above the wire — filter compilation, normalization, sort, render, header round-trip, merge, the conflict gate, comment append, and the field setter — runs for real, so the query and org-representation layers are exercised together rather than in isolation. 388 tests green (384 unit + 4 integration).

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