chore(release): 5.11.0 — the intent approval gate is a new capability

Version 5.11.0 in every file that carries it: .claude-plugin/plugin.json,
package.json, package-lock.json (both entries; they said 5.10.0, drift
from before 5.10.1), the README badge, and a CHANGELOG entry for
everything since v5.10.1. Chose a minor bump because /trekplan gains a
halt (a new capability, additive schema). Handover 1 changes for
downstream producers: their briefs stop at /trekplan until approved.

No tag and no catalog bump here: release-plugin.mjs runs in the operator's
push round.

Suite after git add: 1234 tests, 1232 pass / 0 fail / 2 skip in 2 of 3
runs. The third failed only the known timing test otel SC #14 tail-latency
(877 ms against an 800 ms ceiling), which this order leaves alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "voyage",
-  "version": "5.10.1",
+  "version": "5.11.0",
   "private": true,
   "description": "Voyage — brief, research, plan, execute, review, continue. Contract-driven Claude Code pipeline. /trekbrief, /trekplan, and /trekreview each end by building a self-contained operator-annotation HTML (scripts/annotate.mjs, modelled on claude-code-100x): select text or click any heading/paragraph/list-item, pick intent (Fiks/Endre/Spørsmål), write comment, copy structured prompt, paste back, Claude revises the .md.",
   "type": "module",