Epic: unified, chronological activity timeline across the company

[graycyrus]

Summary

The event model (CompanyEvent, ~20 variants, every one timestamped + actor'd) and the ledger are mature. The gap is a unifying read-side feed: today activity is scattered across 4 separate, deliberately-scoped surfaces (chat, Task Detail, Observatory, ledger views) with no single chronological view of "everything that happened." Most event variants also lack a general reason/rationale field — only some (TurnFailed, ApprovalResolved) carry one.

Plan

• Backend: unify CompanyEvent + ledger writes into one read-side projection
• Add a general reason/rationale field to variants that lack one
• Frontend: one chronological company-wide feed surface

Part of

September 2026 roadmap.

[tinysweeper]

Unify scattered activity surfaces into a single chronological company-wide timeline; add reason/rationale fields to event variants that lack them.

Labelled priority: p3.