v0.21.0

[0.21.0] - 2026-04-29

Changed

• Document the recommended parent-agent workflow as clarify → planner → worker → fresh reviewers → worker in the docs and bundled skill.
• Packaged planner, worker, and oracle now default to forked session context when the launch omits context; explicit context: "fresh" still overrides the agent default.
• Expanded builtin subagent guidance so agents with a safe pi-intercom target can hand results back with blocking intercom ask, documented the self-orchestrated clarify → plan → implement → review workflow, and added GPT-5.5-oriented subagent prompt guidance to the bundled skill and context-builder.

Fixed

• Prevent child subagents from receiving parent orchestration tooling/history, and inject boundary instructions that forbid sub-delegation and pseudo tool calls.
• Added active-long-running and repeated mutating-tool failure notices so supervised/forked workers cannot burn turns silently while still appearing healthy.
• Fixed task editor wrapping so wide characters cannot push text past the right border.
• Mark implementation subagents as failed when they complete without any file mutation attempt.
• Applied the same no-mutation completion guard to async/background runner paths.
• Split terminal no-mutation guard notices from live idle notices so completed failures do not suggest status or interrupt commands.
• Clarified worker/intercom bridge instructions so blocked decisions use intercom ask and stay alive for the reply instead of completing with a question.
• Labeled the Agents widget as async/background work so running detached agents are easier to identify.
• Reworked parallel progress wording so parallel runs show running/done agent counts (and chain parallel groups show step X/Y · parallel group with agent fractions) instead of serial step X/Y counters.
• Expanded /parallel-cleanup guidance to flag redundant wrapper tests when one focused regression is enough.
• Fixed flexible schema validation for reads and skill overrides so reads: false, skill: "review", and skill: false no longer trigger element.reads.every is not a function (issue #124).
• Hardened slash-result and async-widget animation timers so stale extension contexts after /new or reload stop their timers instead of crashing on ctx.ui access (issue #122).