Add second real-life reference meeting (Progeo)

- add second real-life Whisper transcript
- add cleaned transcript
- add Meeting Context scaffold
- document evaluation characteristics
- prepare reusable reference dataset

samples/real_live/progeo_meeting/README.md

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+# Progeo Meeting
+
+Real-Life Reference Meeting #2 for Meeting Lab.
+
+This sample provides an additional real meeting dataset for evaluating the
+pipeline beyond the project-process meeting. It is intended for quality
+assessment, regression analysis and comparison of pipeline behaviour across
+different meeting structures.
+
+## Files
+
+- `progeo_meeting_speech.json`: original Whisper JSON transcript.
+- `progeo_meeting_speech_cleaned.json`: cleaned Whisper JSON transcript
+  generated with `scripts/clean_whisper_json.py`.
+- `meeting_context.yaml`: Meeting Context V1 scaffold.
+
+## Meeting Context Status
+
+The Meeting Context is intentionally incomplete. It contains only known
+meeting-level metadata and no inferred participants.
+
+Participant, mentioned-person, organization, department, alias and known-entity
+metadata require manual completion before context-aware extraction should be
+treated as authoritative for this sample.
+
+## Known Characteristics
+
+- Strongly uneven speaking shares.
+- Comparatively stable discussion topics.
+- Intended as an additional evaluation dataset.
+
+## Preparation Notes
+
+The cleaned transcript was created with:
+
+```text
+.venv/bin/python scripts/clean_whisper_json.py \
+  samples/real_live/progeo_meeting/progeo_meeting_speech.json \
+  -o samples/real_live/progeo_meeting/progeo_meeting_speech_cleaned.json
+```
+
+Cleaning result:
+
+- Segments before: 1448
+- Segments after: 1448
+- Segments removed: 0