feat: deepen harness ecosystem analysis and topics

feat: refine codex comparison diagram structure

docs: sync codex topic and site to workflow findings

docs: align opencode root-site framing

feat: sync opencode topic app to workflow findings

docs: add opencode to openagent capability note

feat: surface evidence status in topic diagrams

docs: add article evidence reading method

Merge branch 'codex/harness-taxonomy'

docs: split agent harness and harness engineering docs

docs: align homepage to harness taxonomy

docs: add harness taxonomy plan and design

build: generate topic sites during root build

feat: integrate additional comparison cases into main switcher

feat: add get-shit-done boundary draft scaffold