Document project architecture and development methodology

- add AGENTS.md with development and prompt-engineering rules
- add PROJECT_KNOWLEDGE.md summarizing current architecture and findings
- add CHANGELOG.md
- add ROADMAP.md
- establish experiments.md as the project's experiment log
- document Canonical Meeting Knowledge architecture
- document Output Views and Knowledge Objects
- capture accepted experimental results and engineering methodology

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+### Added
+
+- Initial Meeting Lab project structure with source, docs, prompts, samples and
+  tests directories.
+- Deterministic transcript normalization module.
+- Technical transcript chunking with block-aligned chunk generation.
+- Whisper JSON cleanup support.
+- Local Ollama-based chunk extraction flow.
+- Interim Markdown meeting protocol builder for technical validation.
+- Initial and windowed topic segmentation prototypes plus review tooling.
+- Gold Standard extraction corpus and gold-test runner.
+- Prompt loading support and common/decision prompt baseline.
+- Output-view architecture documentation for Canonical Meeting Knowledge,
+  Working Protocol / Arbeitsprotokoll, Distribution Protocol /
+  Verteilerprotokoll and Knowledge Objects / Wissensdatenbankeintrag.
+
+### Changed
+
+- Refined the architecture from a single meeting protocol toward Canonical
+  Meeting Knowledge as the planned semantic source of truth.
+- Clarified that Working Protocol, Distribution Protocol and Knowledge Objects
+  are parallel renderings, not derived from one another.
+- Updated decision extraction semantics to include explicit process decisions
+  and deferrals.
+- Simplified extraction prompt assembly around prompt files.
+
+### Fixed
+
+- Fixed Whisper JSON chunk extraction to prefer `segments[*].text` over the
+  aggregate top-level `text` field.
+- Added chunking tests to ensure chunks do not duplicate later blocks when no
+  overlap is requested.
+- Added parser handling for model responses that contain thinking text before
+  the final JSON object.
+
+### Documentation
+
+- Added architecture, pipeline and data-model documentation.
+- Added output-view documentation.
+- Added Gold Standard prompt-engineering methodology.
+- Added formal decision-definition documentation.
+- Added scenario README files for the Gold Standard corpus.
+