feat(acp): implement unstable session features (list, fork, resume)#949
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feat(acp): implement unstable session features (list, fork, resume)#949
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Add G12/G13/G14 from Epic 6 of the ACP gap analysis: - `list_sessions`: enumerate in-memory sessions with optional cwd filter - `fork_session`: clone session history into a new session and spawn agent loop - `resume_session`: restore session from SQLite without replaying event history Feature-gate all three methods and capability advertisement behind `unstable-session-list`, `unstable-session-fork`, `unstable-session-resume` crate features, which forward to the corresponding SDK flags. A composite `acp-unstable` feature is added to the root crate and to `full`. Resolves #931
Update zeph-acp README with Feature Flags section covering the three unstable session feature flags. Extend docs/src/advanced/acp.md with an Unstable session features section and docs/src/reference/feature-flags.md with crate-level entries for unstable-session-list/fork/resume and the composite acp-unstable root flag.
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Resolve merge conflicts with origin/main: preserve set_session_mode, current_mode_update, and PromptCapabilities from main alongside the unstable session list/fork/resume features from this branch.
Rewrite zeph-acp README with detailed subsections for each unstable feature flag, document acp-http flag, add [!WARNING] callout. Rewrite docs/src/advanced/acp.md unstable section: fix method names (list_sessions/fork_session/resume_session, not ext_method paths), add request/response parameter tables, JSON examples, and behavioral notes for each method. Update docs/src/reference/feature-flags.md: correct method names, add cross-reference links to acp.md subsections, expand acp-unstable composite flag description.
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Feb 26, 2026
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Summary
list_sessions: enumerate in-memory sessions with optionalcwdfilter, returnsSessionInfolistfork_session: clone session history from SQLite into a new session ID and spawn a fresh agent loopresume_session: restore a persisted session without replaying event history (contrast withload_session)unstable-session-list,unstable-session-fork,unstable-session-resumecrate features forwarding to SDK feature flagsacp-unstableroot feature added, included infullinitialize()advertisesSessionCapabilitieswhen relevant features are enabledTest plan
cargo nextest run -p zeph-acp --features unstable-session-list,unstable-session-fork,unstable-session-resume— 115 tests passcargo nextest run --workspace --lib --bins— 2854 tests passcargo clippy --workspace -- -D warnings— no warningscargo +nightly fmt --check— clean--features acp-unstableand verify ACP client seessessionCapabilitiesininitializeresponseResolves #931