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/voyage/examples/02-real-cli/fixtures/poem.txt

@@ -0,0 +1,5 @@
+foo on this line
+nothing here
+foo and foo here
+silence
+foo

plugins/voyage/examples/02-real-cli/fixtures/sample.txt

@@ -0,0 +1,9 @@
+Foo bar baz
+The quick brown fox jumps over the foo
+foo foo bar foo
+food for thought.
+fooo, fooooo, very loud
+This line has no match here.
+A line without the magic word
+And another one without it
+The end. Final period.