Add ask command for natural-language search across meeting notes

[paberr]

Two-stage LLM pipeline: first identifies relevant meetings from summaries, then answers from full transcripts with quote verification. Includes spinner UX, meeting source citation in answers, keyword fallback, and context_size config option.

[Copilot]

Pull request overview

Adds a new ownscribe ask CLI command that performs two-stage natural-language search over stored meeting notes: first selecting relevant meetings from summaries, then answering from full transcripts with quote verification and citations.

Changes:

• Introduces ownscribe.search implementing meeting discovery, summary chunking, LLM-based meeting selection, transcript answering, and quote verification (with keyword fallback).
• Adds Summarizer.chat(...) to the summarization interface and implements it for Ollama/OpenAI backends (including OpenAI response_format fallback behavior).
• Adds extensive automated tests for search behavior and OpenAI JSON-mode fallback; wires the new ask command into CLI + docs/config.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/test_search.py	Adds unit + integration tests for meeting search/ask pipeline and quote verification.
tests/test_pipeline.py	Updates mocks to patch the new create_summarizer factory.
src/ownscribe/summarization/prompts.py	Adds search-specific system/user prompts for find/answer stages.
src/ownscribe/summarization/openai_summarizer.py	Implements chat() with JSON response_format fallback attempts.
src/ownscribe/summarization/ollama_summarizer.py	Implements chat() with optional JSON formatting.
src/ownscribe/summarization/base.py	Extends Summarizer ABC with chat().
src/ownscribe/summarization/init.py	Adds shared create_summarizer(config) factory.
src/ownscribe/search.py	New search/ask implementation: discovery, ranking, LLM stages, quote verification, context sizing.
src/ownscribe/pipeline.py	Switches to shared create_summarizer factory.
src/ownscribe/config.py	Adds summarization.context_size config option and docs comment.
src/ownscribe/cli.py	Adds the ask subcommand and options (--since, --limit).
README.md	Documents ask usage and the two-stage pipeline behavior.

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