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/tests/validators/architecture-discovery.test.mjs

@@ -1,81 +0,0 @@
-import { test } from 'node:test';
-import { strict as assert } from 'node:assert';
-import { mkdtempSync, mkdirSync, writeFileSync, rmSync } from 'node:fs';
-import { tmpdir } from 'node:os';
-import { join } from 'node:path';
-import { discoverArchitecture } from '../../lib/validators/architecture-discovery.mjs';
-
-function setup(structure) {
-  const root = mkdtempSync(join(tmpdir(), 'trekplan-arch-'));
-  for (const [path, content] of Object.entries(structure)) {
-    const full = join(root, path);
-    mkdirSync(join(full, '..'), { recursive: true });
-    writeFileSync(full, content);
-  }
-  return root;
-}
-
-test('discoverArchitecture — canonical overview.md found cleanly', () => {
-  const root = setup({ 'architecture/overview.md': '# Overview\n' });
-  try {
-    const r = discoverArchitecture(root);
-    assert.equal(r.found, true);
-    assert.match(r.overview, /architecture\/overview\.md$/);
-    assert.equal(r.warnings.length, 0);
-    assert.equal(r.firstHeading, 'Overview');
-  } finally { rmSync(root, { recursive: true, force: true }); }
-});
-
-test('discoverArchitecture — no architecture dir = not found, no warnings', () => {
-  const root = setup({ 'brief.md': 'b' });
-  try {
-    const r = discoverArchitecture(root);
-    assert.equal(r.found, false);
-    assert.equal(r.warnings.length, 0);
-  } finally { rmSync(root, { recursive: true, force: true }); }
-});
-
-test('discoverArchitecture — non-canonical name discovered with warning (drift-WARN)', () => {
-  const root = setup({ 'architecture/architecture-overview.md': '# Drifted\n' });
-  try {
-    const r = discoverArchitecture(root);
-    assert.equal(r.found, true);
-    assert.ok(r.warnings.find(w => w.code === 'ARCH_NON_CANONICAL_OVERVIEW'));
-  } finally { rmSync(root, { recursive: true, force: true }); }
-});
-
-test('discoverArchitecture — loose unknown files surfaced as drift warning', () => {
-  const root = setup({
-    'architecture/overview.md': '# OK\n',
-    'architecture/random-note.md': 'x',
-    'architecture/another.md': 'y',
-  });
-  try {
-    const r = discoverArchitecture(root);
-    assert.equal(r.found, true);
-    assert.ok(r.warnings.find(w => w.code === 'ARCH_LOOSE_FILES'));
-    assert.equal(r.looseFiles.length, 2);
-  } finally { rmSync(root, { recursive: true, force: true }); }
-});
-
-test('discoverArchitecture — gaps.md detected when present', () => {
-  const root = setup({
-    'architecture/overview.md': '# OK\n',
-    'architecture/gaps.md': '# Gaps\n',
-  });
-  try {
-    const r = discoverArchitecture(root);
-    assert.match(r.gaps, /architecture\/gaps\.md$/);
-  } finally { rmSync(root, { recursive: true, force: true }); }
-});
-
-test('discoverArchitecture — never reads body beyond first heading', () => {
-  const root = setup({
-    'architecture/overview.md': '# Overview\n\n## Components\n\nlots of detail that we MUST NOT validate\n',
-  });
-  try {
-    const r = discoverArchitecture(root);
-    assert.equal(r.firstHeading, 'Overview');
-    // Validator does not assert on Components section — that's the contract.
-  } finally { rmSync(root, { recursive: true, force: true }); }
-});