chore(main): release 0.21.0

[patchmill-release-please-bot]

🤖 I have created a release beep boop

0.21.0 (2026-10-14)

Features

• deps: update Superpowers to v6.4.2 (#272) (b3f8583)
• host: implement Forgejo planning pull request adapter (#215) (6055479)
• host: implement GitHub planning pull request adapter (#213) (2981fd4)
• planning: add conditional frontend design and independent review (#323) (c570b3a)
• run-once: integrate planning phases and require implementation pull requests (#220) (9efb136)
• run-once: make failure reasons actionable (#261) (a04640f)
• run-once: publish planning pull request phases (#217) (dc22d38)
• run-once: recover or reset blocked run-once runs (#204) (0b27041)
• run-once: support concurrent explicit issue runs (#295) (520b181)
• skills: add simple-english to the recommended skill pack (#274) (516e0d6)
• skills: default to inline execution with one final review (#289) (83846f0)
• workflow: Add durable planning state and pull request workspaces (#216) (7b4856f)
• workflow: add non-invasive comment-backed issue state (#279) (961ab75)
• workflow: define provider-neutral planning pull request foundations (#209) (470891c)
• workflow: migrate planning pull request workflow (#223) (82955e3)
• workflow: use conventional titles for planning pull requests (#228) (2aa4024)

Bug Fixes

• deps: fail fast on stale runtime dependencies (#200) (69bab32)
• deps: reuse pi-subagents upgrade PR (#202) (8a98c2d)
• deps: support compiled pi-subagents workflow checks (a0f7723)
• git: ignore artifacts in planning workspace checks (#241) (d38514f)
• run-once: adopt blocked-agent commits when resuming implementation (e57ef2c)
• run-once: explain admission conflicts and safe retries (#324) (7a904f3)
• run-once: make pending planning cleanup recoverable (#246) (e43dce4)
• run-once: preserve ignored state during blocked retry (#212) (cd94670)
• run-once: prevent planning phase coordinator hangs (#284) (4c1b215)
• run-once: reconcile merged revised planning heads (#275) (45d883a)
• run-once: recover planning merges after history rewrites (#266) (f08e245)
• run-once: recover revised planning pull requests (#269) (2ff7553)
• run-once: recover stale planning issue locks (#277) (9cb588b)
• run-once: remove ignored phase-worktree content (#299) (d742a5b)
• run-once: repair abbreviated implementation OID reports (#315) (dea6339)
• run-once: restore planning phase terminal progress (#251) (932d9de)
• run-once: run-once starvation from approval waits (#258) (d43f913)
• run-once: stamp fresh planning state with the frozen run clock (736afa7)
• run-once: stop ignored content blocking recovery and legacy cleanup (#313) (aab6451)
• run-once: surface the agent blocker when its workspace is unsafe (d24172a)
• run-once: unblock committed planning artifact recovery (#312) (dada38a)
• site: patch unsafe stale cache reuse (1978053)
• site: remediate dependency advisories (#214) (#218) (da9b143)
• site: update smol-toml to remediate avisory GHSA-7w5x-hrqm-74c2 (#221) (4c39619)
• skills: align planning artifact paths with workflow (ab590b8)
• tests: accept bundled Pi CLI paths (c69b151)
• validation: restore baseline quality gates (#208) (7a51191)
• workflow: accept server pull ref for merged planning pull requests (af1ef7c)

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