feat(plan): run planner with codex gpt-5.3-codex xhigh

Merge pull request #3 from hlexx/feature/codex-primary-on-upstream

refactor(cli): reduce run complexity and fix err shadow

fix(cli): remove duplicate codex dependency check after merge

Merge remote-tracking branch 'hlexx/codex-primary-minimal' into feature/codex-primary-on-upstream

fix(cli): resolve run lint issues

Merge remote-tracking branch 'origin/master' into feature/codex-primary-on-upstream

docs: document codex-primary CLI and codex review prompts

feat(cli): add codex-primary mode and runtime codex overrides

feat(config): add codex-specific review prompt support

fix: append progress files on restart instead of truncating (#130)

docs: update changelog for v0.15.0

fix: add PLANS_DIR to doc comments, remove duplicate plan file

docs: add unbounded line reader implementation plan

fix: use plans_dir from config in make_plan prompt