docs: chat sessions design (save every chat, resume any chat) - #60
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Pull request overview
Adds a proposed design document for persistent chat sessions in extensions/levelcode-ai, aiming to make chats autosaved, discoverable via History, and resumable (including long sessions via compaction-on-resume), using an append-only JSONL storage format under ~/.levelcode/sessions/<project-slug>/.
Changes:
- Introduces a sessions persistence design based on per-session JSONL event logs and a rebuildable per-project index.
- Specifies a three-tier resume strategy that reuses existing compactAgentMemory() logic only when needed to fit context limits.
- Outlines UI/commands/settings plus phased implementation and test/exit criteria.
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docs/levelcode-chat-sessions-design.md
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| - **Append-only.** One `fs.appendFile` per turn (debounced 500ms), fsync'd. Never | ||
| rewrite the file except `compact` events, which are *also appended* — a compaction | ||
| is an event in the history, not a rewrite of it. |
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Design for chat sessions: every chat autosaved locally as append-only JSONL under ~/.levelcode/sessions//, History UI, three-tier resume that reuses compactAgentMemory (summarize to FIT the context window, never to store), cheap-lane auto titles. Grounded in prior art: adopts Claude Code's plain-JSONL/project-slug model, avoids Copilot's workspace-hash + load-bearing-index failure modes (vscode#285059/#301793/#305818) and Cursor's opaque SQLite. Four phases with exit tests.