Fix remaining critical, high, and medium issues from 4-perspective review

Critical fixes:
- Fix rating clamp range 1-10 → 1-5 (actual scale)
- Add `ietf ideas convergence` command (SequenceMatcher at 0.75 threshold)
- Fix "628 cross-org ideas" → 130 (verified from current DB) across 8 files

Security fixes:
- Sanitize FTS5 query input (strip special chars + boolean operators)
- Add rate limiting (10 req/min/IP) on Claude-calling endpoints
- Change <path:name> → <string:name> on draft routes

Codebase fixes:
- Add Database context manager (__enter__/__exit__)
- Wire false_positive filtering into queries (exclude by default in web UI)
- Fix Post 3 arithmetic ("~300" → "~409" distinct proposals)

Content & licensing:
- Add MIT LICENSE file
- Add IPR/FRAND notes (BCP 79, RFC 8179) to Posts 03 and 07
- Qualify "4:1 safety ratio" with monthly variation in 6 remaining files
- Add "Data as of March 2026" freeze-date headers to all 10 blog posts
- Hedge causal language in Post 04

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/webui/templates/draft_detail.html

@@ -101,6 +101,7 @@
                 <svg class="w-4 h-4 text-slate-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z"/></svg>
                 AI Rating Analysis
             </h2>
+            <p class="text-xs text-slate-500 mb-3">Rated by Claude AI on five dimensions (1–5 scale). The composite score is a weighted average. Ratings are generated from the draft's abstract and full text.</p>
             {% if draft.rating.summary %}
             <p class="text-sm text-slate-400 mb-5 leading-relaxed">{{ draft.rating.summary }}</p>
             {% endif %}
@@ -140,6 +141,7 @@
                 <svg class="w-4 h-4 text-slate-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9.663 17h4.673M12 3v1m6.364 1.636l-.707.707M21 12h-1M4 12H3m3.343-5.657l-.707-.707m2.828 9.9a5 5 0 117.072 0l-.548.547A3.374 3.374 0 0014 18.469V19a2 2 0 11-4 0v-.531c0-.895-.356-1.754-.988-2.386l-.548-.547z"/></svg>
                 Extracted Ideas <span class="text-slate-600 font-normal">({{ draft.ideas|length }})</span>
             </h2>
+            <p class="text-xs text-slate-500 mb-3">Technical ideas extracted by Claude AI from the draft text. Each idea is classified by type (protocol, mechanism, framework, architecture) and rated for novelty (N:1–5).</p>
             <div class="space-y-3">
                 {% for idea in draft.ideas %}
                 <div class="bg-slate-800/30 rounded-lg p-4 border border-slate-800/50">
@@ -174,7 +176,8 @@
         </div>
         {% endif %}
 
-        <!-- Annotation (notes & tags) -->
+        <!-- Annotation (notes & tags) — admin only -->
+        {% if is_admin %}
         <div class="detail-card rounded-xl border border-slate-800 p-6" id="annotationSection">
             <h2 class="text-sm font-semibold text-slate-300 mb-3 flex items-center gap-2">
                 <svg class="w-4 h-4 text-slate-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"/></svg>
@@ -207,6 +210,7 @@
             </button>
             <div id="saveStatus" class="text-xs text-center mt-2 text-slate-600"></div>
         </div>
+        {% endif %}
     </div>
 
     <!-- Right column: Sidebar -->
@@ -242,6 +246,7 @@
                 <svg class="w-4 h-4 text-slate-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12l2 2 4-4m5.618-4.016A11.955 11.955 0 0112 2.944a11.955 11.955 0 01-8.618 3.04A12.02 12.02 0 003 9c0 5.591 3.824 10.29 9 11.622 5.176-1.332 9-6.03 9-11.622 0-1.042-.133-2.052-.382-3.016z"/></svg>
                 Standards Readiness
             </h2>
+            <p class="text-xs text-slate-500 mb-2">Estimates how close a draft is to becoming a standard, based on six factors: working group adoption, revision count, reference density, citation count, author track record, and momentum signals. Score 0–100.</p>
             <!-- Gauge -->
             <div class="relative w-full h-6 bg-slate-800 rounded-full overflow-hidden mb-2">
                 <div class="h-full rounded-full transition-all duration-700