[Feature Request] Import builtin Pi sessions through local history sync

[Astro-Han]

Affected area

Agent runtime / ACP

Problem or workflow pressure

Local project history sync ("Conversation sync") cannot import builtin Pi sessions. Selecting Pi fails immediately with:

builtin:pi ACP agent does not advertise sessionCapabilities.list

The history importer lists sessions with ACP session/list and imports one with session/load, but the managed Pi adapter (packages/acp-extension-pi) only implements session/resume. Users who work in Pi's own terminal UI, or who created Pi chats before, cannot bring those sessions into Lody.

Desired outcome

Pi sessions for a project appear in Conversation sync and can be imported with their user messages, assistant text/thinking, tool calls and todo checklists. Continuing an imported session resumes the same native Pi session file. Ordinary Pi chat resume keeps its current behavior (no full-history replay).

Proposed solution

• Adapter (feat: list and load native Pi sessions over ACP acp-extension-pi#4): session/list reads Pi's native session files read-only through Pi's own SessionManager; session/load switches like resume, then replays the current branch from get_entries with Pi's own tool call ids.
• Host: prefer session/resume over session/load for builtin Pi, as already done for Kimi, so advertising loadSession does not change ordinary resume.
• Maintainers publish a new managed Pi runtime artifact from the adapter revision.

Alternatives or workarounds

Codex uses the Lody extension _lody/session/history/read instead of session/load, but the importer gates it to builtin Codex; standard ACP load needs no provider branch in the importer.

Trade-offs or non-goals

Images, compaction summaries and abandoned branches are not replayed. Legacy pi-acp session ids remain non-resumable.

Additional context

No response

Before submitting

• I searched the existing issues and did not find a duplicate request.
• This request concerns an open-source component in this repository, not a hosted service, Web or mobile app, account, or billing issue.
• I removed credentials, private source, conversations, prompts, personal data, and other sensitive information.

[Leeeon233]

Could this issue be closed? @Astro-Han