Remove obsolete [1m] model variants

Since March 2026 the 1M-token context window is the default for Opus 4.6/4.7
and Sonnet 4.6 – no separate variant or beta header needed. The "[1m]" suffix
on model IDs is dead code now and would even produce HTTP 400 against the
current API.

Cleanup:
- Drop 3 [1m] options from the agent model dropdown; default selection moves
  from opus-4-7[1m] to opus-4-7.
- Drop 5 [1m] mappings from ResolveModelId and add a defensive Replace as a
  safety net for any agent record still holding an old value.
- One-shot startup migration on agents.model + chains.model strips the suffix
  so existing chains can be re-chatted without errors.
- ARCHITECTURE.md reflects the slimmed list and explains why 1M is now default.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ARCHITECTURE.md

@@ -844,7 +844,7 @@ Ein **Agent** definiert die Persönlichkeit und Fähigkeiten der AI:
 |-------------------|------------------------------------------------------------------|
 | `Name`            | Anzeigename                                                     |
 | `Avatar`          | Base64 Data-URL (WebP, 512px) + `AvatarSmall` (WebP, 256px Thumbnail) |
-| `Model`           | `sonnet`, `sonnet-4-5`, `sonnet-4-6`, `sonnet-4-6[1m]`, `opus`, `opus-4-5`, `opus-4-6`, `opus-4-6[1m]`, `opus-4-7`, `opus-4-7[1m]`, `haiku`, `haiku-4-5` (Default für `opus` ist `claude-opus-4-7`) |
+| `Model`           | `sonnet`, `sonnet-4-5`, `sonnet-4-6`, `opus`, `opus-4-5`, `opus-4-6`, `opus-4-7`, `haiku`, `haiku-4-5` (Default für `opus` ist `claude-opus-4-7`) |
 | `CustomCommands`  | JSON-Array mit Slash-Commands (Label + Prompt)                   |
 | `AutoCommit`      | `""` (nichts), `"mention"` (anmerken – nur auf User-Request), `"enforce"` (erzwingen – nach jeder Änderung), `"forbid"` (strikt verboten) |
 | `UseSoul`         | SOUL.md in System-Prompt einbinden                               |
@@ -860,23 +860,18 @@ Ein **Agent** definiert die Persönlichkeit und Fähigkeiten der AI:
 
 ```
 "sonnet"          → claude-sonnet-4-6
-"sonnet[1m]"      → claude-sonnet-4-6[1m]   (1M Context)
 "sonnet-4-5"      → claude-sonnet-4-5
 "sonnet-4-6"      → claude-sonnet-4-6
-"sonnet-4-6[1m]"  → claude-sonnet-4-6[1m]
 "opus"            → claude-opus-4-7
-"opus[1m]"        → claude-opus-4-7[1m]     (1M Context)
 "opus-4-5"        → claude-opus-4-5
 "opus-4-6"        → claude-opus-4-6
-"opus-4-6[1m]"    → claude-opus-4-6[1m]
 "opus-4-7"        → claude-opus-4-7
-"opus-4-7[1m]"    → claude-opus-4-7[1m]
 "haiku"           → claude-haiku-4-5
 "haiku-4-5"       → claude-haiku-4-5
 (default)         → claude-sonnet-4-6
 ```
 
-Das `[1m]`-Suffix aktiviert das **1-Million-Token-Context-Fenster** (Anthropic Beta-Feature, längere History/größere Codebases möglich).
+**1-Million-Token-Context** ist seit März 2026 Default bei **Opus 4.6/4.7/4.8 + Sonnet 4.6** – kein separater Beta-Header und kein `[1m]`-Suffix mehr nötig. Alte DB-Einträge mit `[1m]`-Suffix werden bei Startup automatisch migriert (`UPDATE agents/chains SET model = REPLACE(model, '[1m]', '')`).
 
 ---
 

Services/ChatService.cs

@@ -34,20 +34,20 @@ public class ChatService
         // OpenAI-kompatible Provider werden unverändert durchgereicht (Format: "provider:model")
         if (OpenAiService.IsOpenAiProvider(model)) return model;
 
+        // Defensiv-Strip: alte "[1m]"-Suffixe aus DB transparent normalisieren.
+        // 1M-Context ist seit März 2026 Default bei Opus 4.6/4.7/4.8 + Sonnet 4.6 – kein Suffix mehr nötig.
+        if (!string.IsNullOrEmpty(model) && model.Contains("[1m]"))
+            model = model.Replace("[1m]", "");
+
         return model switch
         {
             "sonnet" => "claude-sonnet-4-6",
-            "sonnet[1m]" => "claude-sonnet-4-6[1m]",
             "sonnet-4-5" => "claude-sonnet-4-5",
             "sonnet-4-6" => "claude-sonnet-4-6",
-            "sonnet-4-6[1m]" => "claude-sonnet-4-6[1m]",
             "opus" => "claude-opus-4-7",
-            "opus[1m]" => "claude-opus-4-7[1m]",
             "opus-4-5" => "claude-opus-4-5",
             "opus-4-6" => "claude-opus-4-6",
-            "opus-4-6[1m]" => "claude-opus-4-6[1m]",
             "opus-4-7" => "claude-opus-4-7",
-            "opus-4-7[1m]" => "claude-opus-4-7[1m]",
             "haiku" => "claude-haiku-4-5",
             "haiku-4-5" => "claude-haiku-4-5",
             _ => "claude-sonnet-4-6"

Services/DatabaseService.cs

@@ -197,6 +197,15 @@ public partial class DatabaseService
         TryAddColumn(conn, "sessions", "unity_mcp_token", "TEXT");
         TryAddColumn(conn, "messages", "tag", "TEXT");
 
+        // Migration: 1M-Suffix entfernen (Mai 2026). Seit März 2026 ist 1M-Context Default
+        // bei Opus 4.6/4.7/4.8 + Sonnet 4.6 – kein "[1m]"-Suffix mehr nötig.
+        try
+        {
+            conn.Execute("UPDATE agents SET model = REPLACE(model, '[1m]', '') WHERE model LIKE '%[1m]%'");
+            conn.Execute("UPDATE chains SET model = REPLACE(model, '[1m]', '') WHERE model LIKE '%[1m]%'");
+        }
+        catch { /* idempotent */ }
+
         conn.Execute(@"
             CREATE TABLE IF NOT EXISTS agent_skills (
                 id            INTEGER PRIMARY KEY AUTOINCREMENT,

wwwroot/index.html

@@ -201,12 +201,9 @@
         <select id="agentModel">
           <option value="sonnet-4-5">sonnet-4-5</option>
           <option value="sonnet-4-6">sonnet-4-6</option>
-          <option value="sonnet-4-6[1m]">sonnet-4-6[1m]</option>
           <option value="opus-4-5">opus-4-5</option>
           <option value="opus-4-6">opus-4-6</option>
-          <option value="opus-4-6[1m]">opus-4-6[1m]</option>
+          <option value="opus-4-7" selected>opus-4-7</option>
-          <option value="opus-4-7">opus-4-7</option>
-          <option value="opus-4-7[1m]" selected>opus-4-7[1m]</option>
           <option value="haiku-4-5">haiku-4-5</option>
           <optgroup label="OpenAI" id="openaiOptgroup">
             <option value="" disabled>Wird geladen...</option>