test: add gloss orchestration core test suite (red phase)

Two test files for the orchestration core. All 13 tests fail at this
commit because the implementation is still stubbed.

`gloss--orchestrate-fetch-result' gets full N/B/E coverage on the
decision matrix: single def, multi def, the >1 boundary, empty defs
with each combination of :no-defs and :failed populated, and the
all-empty degenerate case.

`gloss--lookup-flow' covers cache hit (no fetch), cache miss with one
def (auto-save), cache miss with multiple (picker), cancelled picker
(no save), no-defs error, and the force-fetch override that bypasses
the cache. Mocks live at network and UI boundaries; persistence runs
against a real temp glossary so the save side effect is validated.

0 files changed, 0 insertions, 0 deletions