Establish initial project architecture

PROJECT_KNOWLEDGE.md

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+# Project Knowledge
+
+## Vision
+
+The project creates a complete pipeline that transforms spoken meetings into structured organizational knowledge.
+
+The transcript is the canonical source.
+
+AI-generated summaries are reproducible artefacts.
+
+---
+
+## Design Principles
+
+Offline-first where practical.
+
+Replaceable AI components.
+
+Vendor independence.
+
+Modular architecture.
+
+Small focused modules.
+
+Simple interfaces.
+
+---
+
+## Core Pipeline
+
+Recorder
+
+↓
+
+Transcription
+
+↓
+
+Speaker Identification
+
+↓
+
+LLM Analysis
+
+↓
+
+Knowledge Extraction
+
+↓
+
+Storage
+
+↓
+
+Export
+
+---
+
+## AI Components
+
+Recorder
+
+Responsible only for recording.
+
+No AI.
+
+---
+
+Transcription
+
+Responsible only for speech-to-text.
+
+No summarization.
+
+---
+
+Speaker Identification
+
+Responsible only for identifying speakers.
+
+Must not modify transcript text.
+
+---
+
+LLM Analysis
+
+Responsible for:
+
+- Summary
+
+- Decisions
+
+- Action Items
+
+- Risks
+
+- Questions
+
+- Knowledge extraction
+
+---
+
+Storage
+
+Stores:
+
+Audio
+
+Transcript
+
+Metadata
+
+AI Results
+
+Knowledge Objects
+
+---
+
+## Architectural Rule
+
+Every module has exactly one responsibility.
+
+---
+
+## Transcript Policy
+
+Never modify the original transcript.
+
+Corrections must create a new derived version.
+
+---
+
+## AI Output Policy
+
+Every AI output should be reproducible.
+
+Prompt version should be stored.
+
+Model should be stored.
+
+Timestamp should be stored.
+
+---
+
+## Long-Term Goal
+
+Every meeting becomes searchable organizational knowledge.
+
+No information should be lost after the meeting.
+
+---
+
+## Engineering Principles
+
+The project follows an architecture-first development approach.
+
+Before implementing a feature:
+
+- define the domain model
+- define module boundaries
+- document architectural decisions
+
+Implementation is intentionally delayed until the architecture is considered sufficiently stable.