v0.5.0 — Antigravity CLI (agy) compaction continuity

Minor release: a third coding agent joins Claude Code and Codex — Google's Antigravity CLI (agy) — plus the memory-quality work from issues #3 through #9.

Added

• Antigravity CLI (agy) compaction continuity. rag install --agy merges one named hook (SessionStart, PreInvocation, Stop) into ~/.gemini/config/hooks.json with check mode, unique backup, and a target-aware rollback record. SessionStart injects pins, domains, project knowledge, and the checkpoint as an ephemeral message; PreInvocation treats a /compact turn as PreCompact (checkpoint, enrichment, versioned compact prompt), detects an automatic-compaction marker after the fact, and recalls error signatures; Stop stores the /compact summary as the handoff and queues mining. Mining and enrichment understand the Antigravity transcript format. Verified facts about Gemini 3.8 Flash / 3.1 Pro (1,048,576-token window) and Antigravity's hook/compaction behaviour: What’s New in 0.5.0.
• Bounded project context (issue #9), retrieval evidence quality (issue #8), claim evidence and inference status (issue #7), atomic fact validity (issue #6), explicit project scope (issue #5), and the reproducible memory benchmark (issue #3).

Fixed

• Lossless, replay-safe session ingestion (issue #4).

Changed

• Price-aware Codex context policy (350K window, compaction at 250K).

Upgrade

uv sync && uv run rag init-db (migrations 013/014), then uv run rag install --agy --check / uv run rag install --agy for Antigravity. Open a new agy conversation in a trusted workspace and review the agentic-rag hook with /hooks. Automatic compaction has not been observed live yet (BACKLOG 0.4).