refactor: switch gloss-fetch result to uniform plist shapeHEADmain

The previous shape (:ok DEFS) | (:empty :no-defs (...) :failed (...)) was malformed as a plist. The :empty tag at position 0 shifted the plist alignment. plist-get on :no-defs or :failed returned nil. Tests had to use (plist-get (cdr result) ...) as a workaround.

The new shape is a uniform plist with all three keys always present: (:defs DEFS :no-defs (SYM ...) :failed (SYM ...)). Consumers branch on whether :defs is non-empty. There is no tag. plist-get works uniformly across success and empty cases.

Updated gloss-fetch.el (rollup function and docstrings), 7 test files, and the design doc (docs/design/gloss.org § Error Handling).

Tested by `make test`. 65 tests pass in 0.36 seconds.

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