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

samples/real_live/progeo_meeting/meeting_context.yaml

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+schema_version: "1"
+
+meeting:
+  meeting_id: "progeo-meeting"
+  title: "Progeo meeting"
+  language: "de"
+  date: null
+  objective: ""
+  notes: "Meeting Context scaffold for Real-Life Reference Meeting #2. Participant and entity metadata require manual completion."
+
+participants: []
+
+mentioned_people: []
+
+organization:
+  name: null
+
+  departments: []
+
+  abbreviations: {}
+
+known_entities:
+  projects: []
+  products: []
+  systems: []
+  locations: []
+  technical_terms: []
+
+context_rules:
+  participant_list_is_authoritative: true
+  do_not_infer_roles: true
+  do_not_infer_departments: true
+  do_not_infer_responsibilities: true
+  do_not_infer_attendance: true
+  mentioned_people_are_not_participants: true