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/hooks/scripts/post-compact-flush.mjs

@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+// Hook: post-compact-flush.mjs
+// Event: PostCompact (Claude Code v2.1.105+)
+// Purpose: Re-inject .session-state.local.json after compaction so
+//          /trekcontinue and `/trekexecute --resume` see fresh
+//          session-state and the model has Handover 7 context immediately
+//          after a context-compaction event.
+//
+// Read-only — never writes. Always exits 0; never blocks compaction.
+//
+// Behavior:
+//   1. Auto-discover the most-recently-modified
+//      <cwd>/.claude/projects/*/.session-state.local.json
+//   2. Validate it via lib/validators/session-state-validator.mjs
+//   3. Emit additionalContext containing project + next_session_label +
+//      status so the next assistant turn has resume context loaded.
+//
+// Notes:
+//   - Uses only node:fs sync APIs that have existed since Node 12 (no
+//     glob dependency — that requires Node 22).
+//   - Silent no-op if no state file is discoverable, or if the file is
+//     malformed. Compaction must not be blocked under any circumstance.
+
+import { readdirSync, statSync } from 'node:fs';
+import { join } from 'node:path';
+import { validateSessionState } from '../../lib/validators/session-state-validator.mjs';
+
+function findActiveStateFile() {
+  // Auto-discover: most recently modified .session-state.local.json
+  // under <cwd>/.claude/projects/*/. Returns absolute path or null.
+  const projectsDir = '.claude/projects';
+  let entries;
+  try { entries = readdirSync(projectsDir, { withFileTypes: true }); }
+  catch { return null; } // .claude/projects/ absent → silent no-op
+  let best = null;
+  let bestMtime = 0;
+  for (const ent of entries) {
+    if (!ent.isDirectory()) continue;
+    const candidate = join(projectsDir, ent.name, '.session-state.local.json');
+    let st;
+    try { st = statSync(candidate); }
+    catch { continue; } // file missing in this project — skip
+    if (st.mtimeMs > bestMtime) {
+      bestMtime = st.mtimeMs;
+      best = candidate;
+    }
+  }
+  return best;
+}
+
+function main() {
+  const stateFile = findActiveStateFile();
+  if (!stateFile) {
+    process.stdout.write(JSON.stringify({})); // silent no-op
+    return;
+  }
+  const result = validateSessionState(stateFile);
+  if (!result.valid || !result.parsed) {
+    process.stdout.write(JSON.stringify({})); // silent fail
+    return;
+  }
+  const p = result.parsed;
+  const summary = `[Session resumed after compact]
+project: ${p.project}
+next_session: ${p.next_session_label}
+status: ${p.status}`;
+  process.stdout.write(JSON.stringify({
+    additionalContext: summary.slice(0, 10000),
+  }));
+}
+
+try { main(); }
+catch { process.stdout.write(JSON.stringify({})); } // never block compaction
+process.exit(0);