feat(agent): split k3 profile context windows — k3 1M, k3-256k 256K

docs/PROVIDERS.md

@@ -38,7 +38,9 @@ odek ships with built-in **model profiles** that automatically apply sensible de
 | `deepseek-chat` | DeepSeek (legacy) | (provider default) | 120s | 128K | General |
 | `deepseek-v4-flash` | DeepSeek v4 Flash | — (faster/cheaper) | 90s | 128K | Quick tasks, coding |
 | `deepseek-v4-pro` | DeepSeek v4 Pro | `enabled` | 180s | **1M** | Deep reasoning |
-| `kimi-…`, `k3…` (e.g. `kimi-for-coding`, `k3-256k`) | Kimi | (provider default) | 300s | 256K | Agentic coding |
+| `kimi-…` (e.g. `kimi-for-coding`) | Kimi | (provider default) | 300s | 256K | Agentic coding |
+| `k3` | Kimi | (provider default) | 300s | **1M** | Agentic coding |
+| `k3-256k` | Kimi | (provider default) | 300s | 256K | Agentic coding |
 | *(any other)* | Generic | (profile default) | 120s | (no limit) | Custom models |
 
 ### How profiles work

odek.go

@@ -293,13 +293,22 @@ var KnownProfiles = []struct {
 		},
 	},
 	{
-		// Kimi Code also ships models under the "k3" family name (k3, k3-256k),
-		// which the "kimi-" prefix does not match.
+		// Kimi Code also ships models under the "k3" family name, which the
+		// "kimi-" prefix does not match. Longest prefix wins: k3-256k is the
+		// 256K variant, bare k3 has a 1M context window.
+		Prefix: "k3-256k",
+		Profile: ModelProfile{
+			Label:      "Kimi",
+			Timeout:    300,
+			MaxContext: 262_144, // 256K token context window
+		},
+	},
+	{
 		Prefix: "k3",
 		Profile: ModelProfile{
 			Label:      "Kimi",
 			Timeout:    300,
-			MaxContext: 262_144,
+			MaxContext: 1_000_000, // 1M token context window
 		},
 	},
 	{

odek_test.go

@@ -542,15 +542,21 @@ func TestLookupProfile_KimiMatch(t *testing.T) {
 		t.Errorf("MaxContext = %d, want 262144", p.MaxContext)
 	}
 
-	// The k3 family (k3, k3-256k) is the same Kimi Code line under a
-	// different prefix — it must get the same profile.
-	for _, model := range []string{"k3", "k3-256k"} {
-		p := LookupProfile(model)
+	// The k3 family is the same Kimi Code line under a different prefix —
+	// longest prefix wins: k3-256k is the 256K variant, bare k3 is 1M.
+	for _, tc := range []struct {
+		model      string
+		maxContext int
+	}{
+		{"k3", 1_000_000},
+		{"k3-256k", 262_144},
+	} {
+		p := LookupProfile(tc.model)
 		if p == nil {
-			t.Fatalf("LookupProfile(%q) returned nil", model)
+			t.Fatalf("LookupProfile(%q) returned nil", tc.model)
 		}
-		if p.Timeout != 300 || p.MaxContext != 262_144 {
-			t.Errorf("LookupProfile(%q) = %+v, want Timeout=300 MaxContext=262144", model, p)
+		if p.Timeout != 300 || p.MaxContext != tc.maxContext {
+			t.Errorf("LookupProfile(%q) = %+v, want Timeout=300 MaxContext=%d", tc.model, p, tc.maxContext)
 		}
 	}
 }