[D1 complete] EcosystemEngine built (presets, EcosystemResult, LANG_EMOJI), 21 tests
[D2 complete] CLI wiring done (ecosystem_cmd, run --ecosystem, main.py), 10 tests
[D3 complete] EcosystemHTMLRenderer dark-theme report (winner banner, standings, detail cards, insight panel), 12 tests
[D4 complete] Doctor check, run_cmd integration, JSON consumer tests, 10 tests
[D5 complete] CHANGELOG v0.71.0, README updated, version bumped, BUILD-REPORT written, 6 tests
[FINAL] 3562 passing (baseline 3504), 58 new tests added, 2 pre-existing failures unchanged
