feat(voyage)!: bump v4.0.0, rename plugin to voyage, CHANGELOG entry [skip-docs]

plugins/ultraplan-local/CHANGELOG.md

@@ -4,6 +4,37 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## v4.0.0 — 2026-05-05
+
+**Breaking. Rebrand. No migration path.**
+
+The `ultraplan-local` plugin is renamed to **Voyage**. All seven commands
+are renamed from `/ultra*-local` to `/trek*`:
+
+- `/ultrabrief-local` → `/trekbrief`
+- `/ultraresearch-local` → `/trekresearch`
+- `/ultraplan-local` → `/trekplan`
+- `/ultraexecute-local` → `/trekexecute`
+- `/ultrareview-local` → `/trekreview`
+- `/ultracontinue-local` → `/trekcontinue`
+- `/ultraplan-end-session-local` → `/trekendsession`
+
+Internal renames: FLAG_SCHEMA keys, stats filenames, env vars, branch
+namespace, type discriminators, hook stderr prefixes, settings.json scope
+keys all updated to `trek*` form. Plugin identity is now `voyage`.
+
+No backward compatibility. Old artifacts on user disks are orphaned.
+Fork-and-own users re-fork from main if they want to follow upstream;
+there is no migration helper.
+
+See `TRADEMARKS.md` for the new trademark hygiene notice clarifying
+independence from Anthropic.
+
+Out-of-scope handoff (operator follow-up): plugin directory rename
+`plugins/ultraplan-local/` → `plugins/voyage/`, marketplace-root
+coordination across `../../README.md`, `../../CLAUDE.md`, and
+`../../.claude-plugin/marketplace.json`.
+
 ## [3.4.1] - 2026-05-04 — `/ultracontinue-local` hot-fix + ultra-cc-architect doc-rydding
 
 Forward-patch on top of v3.4.0. Fixes four bugs in the multi-session