Add session history summarization mode

[arunsathiya]

Right now CCV only handles real-time streaming from claude CLI. I'd like it to also read and summarize old sessions from ~/.claude/projects/.

I review past sessions pretty often, and loading 500MB of raw JSON into Claude's context just to get a summary burns tokens. A --history mode would let me do that locally.

Session files are JSONL with user, assistant, progress, and file-history-snapshot messages. The assistant messages have thinking, text, tool_use, and tool_result blocks. Most of that is noise if you just want to know what happened - thinking blocks are huge, tool results contain entire file contents.

The mode could pull out just the useful bits: user prompts, assistant responses (minus thinking), tool names and counts, timestamps, token usage.

ccv --history ~/.claude/projects/-Users-arun-ccv/
ccv --history --since "2025-01-20"
ccv --history --project ccv --last 5

The content block parsing in types.go already handles most of these structures.

[agusmdev]

Yep, I like it!

[arunsathiya]

Thanks! I put together a quick version for myself. Curious to see what you come up with - happy to compare notes.

[agusmdev]

@arunsathiya what do you think of this approach? #2 would you change/add something?