v4.2.1

What's Changed

Features

• --no-parallel CLI flag — af code --no-parallel forces serial execution (parallel=1) for a single run without editing config.toml (#716)
• Task-group-scoped context rendering — assemble_context() now filters requirements, test specs, and tasks to only content relevant to the active task group, reducing prompt size by an estimated 50-65% for complex specs (#717, #720)
• Preflight gate results in coder prompt — The orchestrator's preflight check results are now passed to the coder's task prompt as a ## Preflight State section, allowing the coder to skip redundant Quick Triage checks and save 2-5 tool calls per session (#718)
• Subtask completion counts in scoped summaries — Non-target task groups in scoped rendering now show (N/M subtasks done) for quick orientation (#720)

Refactors

• Profile deduplication — Removed duplicated rules (conventional commits, Co-Authored-By, stale references, never-push) from maintainer.md, coder_fix.md, and maintainer_fix-triage.md that were already covered by agent.md (#719)
• agent.md rewrite — Replaced the "Understand Before You Code" section with a concise "Pre-Injected Context" acknowledgment and lightweight "Orient Yourself" guidance, eliminating redundant file-reading instructions (#717)
• coder.md cleanup — Removed duplicated stale-reference warning and scope priority already present in agent.md (#717)

Infrastructure

• PreflightResult dataclass — run_preflight() now returns a structured result with gate states (checkboxes_done, has_findings, tests_passed) instead of a bare enum (#718)
• Scoped render functions — render_requirements_scoped(), render_test_spec_scoped(), render_tasks_scoped(), and render_individual_scoped() added to afspec (#717)

Bug Fixes

• Resolved 3 post-refactoring test failures from afissues migration
• Fixed stale agentfox.platform references in test docstrings

Full Changelog: v4.2.0...v4.2.1