diff --git a/PERIHELION_BRIEF.md b/PERIHELION_BRIEF.md
index 4b2b31c..4b42f5b 100644
--- a/PERIHELION_BRIEF.md
+++ b/PERIHELION_BRIEF.md
@@ -255,3 +255,55 @@ Full suite green, online and offline-minus-live-gates.
 
 *Merge order N → M → E → V; Fable reviews each. HERALD (deploy to the VPS) is
 deliberately NOT in this wave — it needs the user's DNS/tunnel decision first.*
+
+---
+
+# Part ω — the closer (added post-merge, Fable 2026-07-16)
+
+**Status: all four lanes MERGED to `main` (`b42473a`), 21/21 gates in-browser,
+pushed.** N→M→E→V merged in order; integration fixes landed in review
+(`sbdb_lookup` → `CONFIG.proxy.sbdbLookup`; era-aware BC dates in `lib.js`;
+V's verify wait-guard raised 13→18 for the merged gate count).
+
+### ω.0 Process note — orchestrator mode is now canon
+
+Wave 2 ran as ONE Opus session dispatching four worktree-locked subagents that
+built headlessly (node + serve.py/curl), with the orchestrator keeping the
+single browser for all verification and real-input tests. **This is the
+endorsed topology for all future multi-lane waves** — it preserves the
+one-tree-one-writer rule and centralizes the thing there's only one of (the
+browser). Lane briefs stay written for individual agents; the orchestrator
+passes each its lane section verbatim.
+
+### ω.1 The closer lane (one agent, branch `perihelion/o-closer` from ≥ b42473a)
+
+1. **README refresh.** README.md still describes wave 1: CDN importmap (it's
+   vendored now), "schematic ring" NEOs (real orbits now), 13 gates (21 now),
+   no Epoch toggle / Sky events / moon textures / decade-century rates. Rewrite
+   the affected sections; keep the voice; update the layer table + controls +
+   verify table + credits (add USGS/NASA moon maps). New `docs/hero.jpg` via
+   the `/snap` endpoint if the old one no longer represents the app (deep-time
+   or Jupiter+textured-Galileans would sell it).
+2. **Timeline event density** (E's flagged UX): the ±2 yr event window maps to
+   ~1.6% of the 250-year strip (worse in deep time). Build the **event band**:
+   a second thin strip directly under `timeline-outer` that maps ONLY the
+   computed window to full width — diamonds live there (same DOM/click-jump
+   machinery, same CSS classes); the main strip gets a subtle bracket marking
+   the window's extent. Events layer owns it; no main.js changes beyond what
+   the layer contract already allows. Real-input gate: click a diamond in the
+   band → clock jumps; near-mode AND deep-mode.
+3. **Housekeeping.** After user confirmation: `git worktree remove` the four
+   lane worktrees and delete the merged `perihelion/*` branches (their commits
+   live in main's merge history). Do NOT touch `../godstrument-*` worktrees.
+4. **Full regression before report:** 21/21 (+ your band gate), zero console
+   errors in near and deep modes, README quickstart from a fresh clone.
+
+### ω.2 Deferred (needs the user, not an agent)
+
+- **HERALD** — deploy to the VPS (domain/tunnel decision → then mirror the
+  godstrument.pro rsync+systemd pattern; serve.py binds loopback, so prod
+  needs the same reverse-proxy shape godstrument uses).
+- **Titan/Europa color** — M shipped grayscale where USGS has no color mosaic
+  (truth boundary held; ENDORSED in review). If the user wants iconic-color
+  moons, that's an explicit directorial choice to source non-data colorized
+  maps — flag it as such in CREDITS if taken.