Reconstruct the timeline across all sources

Reconstruct a unified timeline of events from every source in this notebook.

Produce:
1. A single chronological list of every dated or datable event mentioned across sources. For each event: date (or approximate range), one-line description, and the source it came from.
2. Where two or more sources describe the same event, merge them into one entry and note any disagreements about date, sequence, or detail.
3. Flag any event that only one source reports — mark it [single-source].
4. Identify 2–3 inflection points: moments where the trajectory of the story clearly changes. Explain in one sentence why each is pivotal.
5. List any sequencing conflicts the sources never resolve, and the kind of evidence that would settle each one.

If a source describes events without dates, place them in the relative order suggested by the surrounding sources and mark them [estimated position]. Never invent dates that no source supports.