chore: merge release v1.4.5 to main (#1142)

* chore: bump version to 1.4.5 for hotfix

* fix(#1133): honor model_policy on the claude runtime via alias mapping

model_policy (including the anthropic-fable Claude Fable 5 preset) was
silently ignored on the default `claude` runtime: resolveModelInternal
gated the policy branch on `runtime !== 'claude'`, so agents kept
resolving from model_profile and no warning was emitted.

Wire model_policy into the claude path: map the policy-resolved model ID
back to a Claude Code agent alias (claude-fable-5 -> fable, claude-opus-4-8
-> opus, etc.). A value that is already a bare alias is returned as-is; an
ID with no Claude alias warns once to stderr and falls back to the
configured tier alias rather than emitting an unspawnable ID. Non-claude
runtimes return full IDs verbatim (unchanged) and resolveModelForTier
precedence is unchanged.

Authored against the v1.4.4 base (src/core.cts) for the 1.4.5 hotfix
line — NOT next, where this logic lives in src/model-resolver.cts; the
forward-port to next is a separate follow-up.

Closes #1133

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore: promote CHANGELOG for v1.4.5

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

tests/feat-49-model-policy-presets.test.cjs

@@ -376,34 +376,57 @@ describe('#49 resolveModelInternal: model_policy in the resolution chain', () =>
       'runtime_tiers must not fire when config.runtime is absent');
   });
 
-  test('model_policy is skipped when runtime:"claude" (no-op gate)', () => {
-    // runtime:"claude" is the implicit default and is treated as a no-op
-    // for model_policy resolution (same as the no-op gate in the existing
-    // runtime-aware resolution step). model_policy provider preset
-    // for anthropic may still fire — but runtime_tiers for claude is a no-op
-    // because claude-native resolution already handles that path.
+  test('model_policy provider preset resolves to a Claude alias on runtime:"claude" (#1133)', () => {
     writeConfig(projectDir, {
       runtime: 'claude',
-      model_profile: 'quality',
+      model_profile: 'balanced',
+      model_policy: { provider: 'anthropic-fable', budget: 'high' },
+    });
+    // gsd-planner -> opus tier; anthropic-fable opus/high = claude-fable-5 -> alias "fable"
+    assert.strictEqual(resolveModelInternal(projectDir, 'gsd-planner'), 'fable');
+  });
+
+  test('model_policy works with implicit claude runtime (no runtime key) (#1133)', () => {
+    writeConfig(projectDir, {
+      model_profile: 'balanced',
+      model_policy: { provider: 'anthropic-fable', budget: 'high' },
+    });
+    // gsd-executor -> sonnet tier; anthropic-fable sonnet/high = claude-fable-5 -> "fable"
+    assert.strictEqual(resolveModelInternal(projectDir, 'gsd-executor'), 'fable');
+  });
+
+  test('unmappable model_policy ID warns and falls back to the tier alias on claude (#1133)', () => {
+    _resetRuntimeWarningCacheForTests();
+    writeConfig(projectDir, {
+      runtime: 'claude',
+      model_profile: 'balanced',
+      model_policy: { provider: 'anthropic-fable', budget: 'low' },
+    });
+    // gsd-planner -> opus tier; anthropic-fable opus/low = claude-opus-4-5 (no alias) -> fall back to "opus"
+    assert.strictEqual(resolveModelInternal(projectDir, 'gsd-planner'), 'opus');
+  });
+
+  test('model_policy.runtime_tiers applies on runtime:"claude", mapped to alias (#1133)', () => {
+    writeConfig(projectDir, {
+      runtime: 'claude',
+      model_profile: 'balanced',
       model_policy: {
         provider: 'anthropic',
         budget: 'high',
-        runtime_tiers: {
-          claude: {
-            opus: { model: 'claude-runtime-tiers-should-not-appear' },
-          },
-        },
+        runtime_tiers: { claude: { opus: { model: 'claude-fable-5' } } },
       },
     });
-    let result;
-    assert.doesNotThrow(() => {
-      result = resolveModelInternal(projectDir, 'gsd-planner');
+    // gsd-planner -> opus tier; runtime_tiers.claude.opus = claude-fable-5 -> "fable" (was a no-op pre-#1133)
+    assert.strictEqual(resolveModelInternal(projectDir, 'gsd-planner'), 'fable');
+  });
+
+  test('model_policy still returns full IDs on non-claude runtimes (#1133 regression)', () => {
+    writeConfig(projectDir, {
+      runtime: 'opencode',
+      model_profile: 'balanced',
+      model_policy: { provider: 'anthropic-fable', budget: 'high' },
     });
-    assert.ok(typeof result === 'string', 'must return a string');
-    // The claude runtime_tiers entry must not appear — model_policy runtime_tiers
-    // is a no-op for runtime:"claude"
-    assert.notStrictEqual(result, 'claude-runtime-tiers-should-not-appear',
-      'model_policy.runtime_tiers must be a no-op when runtime is "claude"');
+    assert.strictEqual(resolveModelInternal(projectDir, 'gsd-planner'), 'claude-fable-5');
   });
 
   test('model_policy is skipped when tier:"inherit"', () => {
@@ -817,4 +840,18 @@ describe('#49 resolveModelForTier: model_policy beats dynamic_routing', () => {
     });
     assert.strictEqual(resolveModelForTier(tmpDir, 'gsd-executor', 0), 'my-sonnet');
   });
+
+  test('model_policy value that is already a bare Claude alias is returned as-is on claude (#1133)', () => {
+    writeConfig(tmpDir, {
+      runtime: 'claude',
+      model_profile: 'balanced',
+      model_policy: {
+        provider: 'anthropic',
+        budget: 'high',
+        runtime_tiers: { claude: { opus: { model: 'fable' } } },
+      },
+    });
+    // gsd-planner → opus tier; runtime_tiers.claude.opus = "fable" is already a valid alias → "fable"
+    assert.strictEqual(resolveModelInternal(tmpDir, 'gsd-planner'), 'fable');
+  });
 });