docs: add milestone roadmap to final vision

docs: add media placeholders

docs: add final vision

docs: add README visual guidance and diagram

docs: strengthen README framing

chore(benchmark): add Windows header inclusion for compatibility

chore(repo): ignore .cache directory

chore(repo): clean root-level debug artifacts and sample placement

ci: reduce masked failures and clarify benchmark/perf jobs

docs: align tutorials and contributing guide with current behavior

docs(readme): fix structure drift and broken sections

refactor(benchmark): split benchmark_suite.cpp into focused translation units

refactor(cli): extract wizard and op-test command handlers

refactor(cli): extract argument parsing from main

test: reduce cross-suite state coupling in unit tests