feat(voyage)!: marketplace handoff — rename plugins/ultraplan-local to plugins/voyage [skip-docs]

Session 5 of voyage-rebrand (V6). Operator-authorized cross-plugin scope.

- git mv plugins/ultraplan-local plugins/voyage (rename detected, history preserved)
- .claude-plugin/marketplace.json: voyage entry replaces ultraplan-local
- CLAUDE.md: voyage row in plugin list, voyage in design-system consumer list
- README.md: bulk rename ultra*-local commands -> trek* commands; ultraplan-local refs -> voyage; type discriminators (type: trekbrief/trekreview); session-title pattern (voyage:<command>:<slug>); v4.0.0 release-note paragraph
- plugins/voyage/.claude-plugin/plugin.json: homepage/repository URLs point to monorepo voyage path
- plugins/voyage/verify.sh: drop URL whitelist exception (no longer needed)

Closes voyage-rebrand. bash plugins/voyage/verify.sh PASS 7/7. npm test 361/361.

plugins/ultraplan-local/examples/01-add-verbose-flag/REGENERATED.md

@@ -1,56 +0,0 @@
-# Regeneration log — 01-add-verbose-flag
-
-| Field | Value |
-|-------|-------|
-| Last regenerated | 2026-05-01 |
-| trekplan version | 3.1.0 |
-| Claude Code version | ≥ 2.1.105 (PreCompact-hook) |
-| Source brief author | Hand-calibrated example, not LLM-generated |
-| Plan author | Hand-calibrated to demonstrate plan_version 1.7 schema + manifest YAML |
-
-## What this is
-
-A complete walk-through of the four-stage pipeline for one realistic
-small task: adding a `--verbose` flag to a hypothetical `small-auth`
-CLI parser. Every artifact is hand-calibrated, not LLM-generated, so
-fork-ers can study the *shape* without worrying about whether an
-LLM hallucinated something.
-
-## What "regenerate" means
-
-If the artifact format changes (frontmatter schema, manifest YAML
-keys, progress.json version), this example needs to be re-built so
-fork-ers don't learn an obsolete shape.
-
-Triggers for regeneration:
-
-- `plan_version` bumps
-- Frontmatter schema additions to `brief.md` or `research/*.md`
-- New required keys in manifest YAML
-- `progress.json` schema bump beyond `schema_version: "1"`
-
-When regenerating: do **not** run an actual LLM-driven pipeline against
-this brief. Hand-calibrate against the new schema so the example stays
-deterministic and reviewable.
-
-## Project assumed
-
-A fictional `small-auth` CLI with this layout:
-
-```
-small-auth/
-├── package.json
-├── src/
-│   ├── cli.mjs                    # 80-line argv parser (hand-rolled)
-│   └── commands/
-│       ├── login.mjs
-│       ├── logout.mjs
-│       ├── whoami.mjs
-│       ├── token-refresh.mjs
-│       ├── users-list.mjs
-│       └── users-create.mjs
-└── tests/                         # 24 tests, node:test
-```
-
-This project is **not** in the plugin repo. The example artifacts
-reference it as if it were the cwd of an `/trekexecute` run.