v0.29.0

Added

• Added package-provided agent and chain discovery from installed Pi packages and package settings, including read-only management behavior, package source counts in doctor output, nested-cwd project package discovery, and package definitions that remain below user/project overrides. Thanks to Fabian Jocks (@iamfj) for #278.
• Added PI_SUBAGENT_EXTRA_AGENT_DIRS and PI_INTERCOM_EXTENSION_DIR overrides so bundled agents and pi-intercom can be loaded from read-only package locations. Thanks to David Barroso (@dbarrosop) for #288.

Fixed

• Show captured output from failed foreground subagents instead of returning only the failure summary. Thanks to Jürgen Schmied (@jschmied) for #277.
• Preserve nested fanout child subagent history when building child prompts. Thanks to James Wood (@jamesjwood) for the original #270 fix.
• Retry Windows atomic JSON renames on transient EPERM, EBUSY, and EACCES failures. Thanks to Wings Butterfly (@wings1848) for #269.
• Inherit the parent session model for subagents instead of falling back to global settings, including foreground, chain, async chain, async single, and resume/revive paths. Thanks to Rogerio Saulo (@rsaulo) for #266 and Nicolas Marchildon (@elecnix) for the original #283 fix.
• Avoid duplicate subagent tool registration in fanout-authorized child processes. Thanks to Aleksei Gurianov (@Guria) for #279.
• Hardened the parallel intercom integration test fixture after Windows CI exposed nondeterministic failure ordering.