update doc

chore(release): bump version to v0.2.1

feat(add-safe-local): add local safety preset flags

feat(harden-cancel): kill codex process group on cancel

feat(add-session-diagnostics): add tail_session and session debug entries

feat(add-workdir-lock): prevent concurrent codex runs per repo

feat(add-change-receipt): include git change receipt in codex output

chore(release): bump version to v0.2.0

chore(release): bump version to v0.1.0

build(add-test-coverage): add Makefile test targets

ci(add-test-coverage): run go test -race on PRs

test(add-test-coverage): mock codex for client.Run tests

test(add-tool-annotations): verify codex annotations in tools/list

feat(add-tool-annotations): annotate codex tool

test(add-progress-notifications): cover reporter and progress notifications