[subinium]

Builds on @shellus's pi work in #43 (already merged to main, commits f727ba4..afc2c09, authorship preserved) and scopes it into a clean pi-only release.

Kept from #43 (verified)

• pi resume by id — pi --session '<id>'. Verified against the pi-mono source (resolveSessionPath, packages/coding-agent/src/main.ts): a bare id with no //\/.jsonl is prefix-matched against the session store, and since agf wraps resume as cd '<project_path>' && pi --session '<id>', pi resolves it locally and resumes directly (no fork prompt). Confirmed on pi 0.53.0.
• Keep every session per project selectable — dedup-to-latest removed now that resume-by-id works.
• pi prompt summaries + full History — parity with other agents.
• CACHE_VERSION 5 — one-time rescan on upgrade.

Follow-ups in this PR

• Revert the default-to-cwd search query — the merged PR pre-filled the search box with $PWD when agf ran with no query. That changed no-arg behavior for every agent (empty list in non-project dirs) and re-introduced the cwd special-casing deliberately removed in v0.11.0 (the cwd-match sort boost made time-sort look broken). Deferred to a future opt-in setting.
• Bound pi parse_session with a 512 KiB read budget — collecting every prompt requires reading the whole JSONL, but pi transcripts can reach several MB and the CACHE_VERSION bump forces a cold rescan for everyone on upgrade. The read loop now stops after 512 KiB (header is line 1, always captured), mirroring read_head_tail (added v0.10.1 after large Claude logs stalled the TUI).
• Restore the Kiro resume-latest note — kiro-cli chat --resume has no per-session flag; note moved onto Agent::Kiro in resume_cmd.
• Regression test for the byte-budget cap.

Test plan

• cargo fmt --all --check
• cargo clippy --all-targets -- -D warnings
• cargo test — 31 passed
• cargo build --release; agf list works across agents; agf --version → 0.11.2
• Diff scoped to 7 intended files; other agents' resume_cmd unchanged