refactor(test): move Android capture fixtures into .json files

The fixture module had grown to 1080 lines, of which ~990 were two inlined
device-capture literals — the walkers and their docs were buried under the data
they operate on, and any future capture would bury them further.

Capture fixtures are archived device trees: DATA to be regenerated from a device,
not code to be hand-edited. They now live in `.json` beside the module and load
via `fs` + `import.meta.url` — the existing `test/output-economy` baseline
pattern, which needs no `resolveJsonModule` or import-attributes support to
typecheck, and keeps the trees out of the bundle.

Mechanically extracted from the current exports and verified byte-identical
(`JSON.stringify` before/after match for both fixtures), so this is a pure move:
no fixture data changed. Module drops 1080 -> 109 lines. The leg-E regression test
remains revert-sensitive.

Author: thymikee