chore(main): release 0.19.0

[patchmill-release-please-bot]

🤖 I have created a release beep boop

0.19.0 (2026-08-06)

Features

• deps: Automate Superpowers upgrade pull requests (#141) (1ad3a44)
• run-once: Add deterministic abortable run-once Pi session streaming (#131) (d64f194)
• run-once: repair implementation sessions missing final JSON (#138) (e50aaea)
• skills: Split interactive planning into user-global Patchmill skills (#132) (0ce4337)
• skills: support agent-neutral interactive skills (#134) (bb27b1a)

Bug Fixes

• ci: repair Pi dependency upgrade workflow (d75afac)
• cli: sanitize inherited Pi package directory (#120) (4319009)
• deps: isolate Superpowers validation fixture (45cce32)
• pi: Fix Pi extension package-root resolution (#128) (22c6b5a)
• run-once: Fix run-once approval recovery (#140) (62f5351)

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