fix(agent-names): use HTTP-header-safe display names and config keys for API calls (#3138)

Display names with parentheses like 'Atlas (Plan Executor)' cause HTTP
header validation errors in x-opencode-agent-name. This was blocking
Atlas/Prometheus from working via /start-work and auto-retry.

Changes:
- Display names: parens -> dashes ('Atlas - Plan Executor')
- Hooks (start-work, no-hephaestus-non-gpt, no-sisyphus-gpt): use
  config keys ('atlas', 'sisyphus', 'hephaestus') for agent API fields
- auto-retry: use config key instead of display name for promptAsync
- agent-override-protection: handle dash-suffix normalization
- Updated all test expectations to match new format

Closes #3138

src/plugin/chat-message.test.ts

@@ -87,7 +87,7 @@ describe("createChatMessageHandler - /start-work integration", () => {
     await handler(input, output)
 
     // then
-    expect(output.message["agent"]).toBe("Sisyphus (Ultraworker)")
+    expect(output.message["agent"]).toBe("sisyphus")
     expect(output.parts[0].text).toContain("<auto-slash-command>")
     expect(output.parts[0].text).toContain("Auto-Selected Plan")
     expect(output.parts[0].text).toContain("boulder.json has been created")
@@ -397,7 +397,7 @@ describe("createChatMessageHandler - TUI variant passthrough", () => {
     //#then
     expect(output.message["model"]).toBeUndefined()
     expect(getSessionModel("test-session")).toEqual({ providerID: "openai", modelID: "gpt-5.4" })
-    expect(getSessionAgent("test-session")).toBe("Prometheus (Plan Builder)")
+    expect(getSessionAgent("test-session")).toBe("Prometheus - Plan Builder")
   })
 
   test("respects a mid-conversation model switch instead of reusing the previous stored model", async () => {

src/plugin/event.model-fallback.test.ts

@@ -92,8 +92,8 @@ describe("createEventHandler - model fallback", () => {
             parentID: "msg_user_1",
             modelID: "claude-opus-4-6-thinking",
             providerID: "anthropic",
-            mode: "Sisyphus (Ultraworker)",
-            agent: "Sisyphus (Ultraworker)",
+            mode: "Sisyphus - Ultraworker",
+            agent: "Sisyphus - Ultraworker",
             path: { cwd: "/tmp", root: "/tmp" },
             cost: 0,
             tokens: { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } },
@@ -184,7 +184,7 @@ describe("createEventHandler - model fallback", () => {
             content: [],
             modelID: "claude-opus-4-6-thinking",
             providerID: "anthropic",
-            agent: "Sisyphus (Ultraworker)",
+            agent: "Sisyphus - Ultraworker",
             path: { cwd: "/tmp", root: "/tmp" },
           },
         },
@@ -246,7 +246,7 @@ describe("createEventHandler - model fallback", () => {
             role: "user",
             modelID: "claude-opus-4-6-thinking",
             providerID: "anthropic",
-            agent: "Sisyphus (Ultraworker)",
+            agent: "Sisyphus - Ultraworker",
           },
         },
       },
@@ -314,7 +314,7 @@ describe("createEventHandler - model fallback", () => {
             role: "user",
             modelID: "claude-opus-4-6",
             providerID: "quotio",
-            agent: "Sisyphus (Ultraworker)",
+            agent: "Sisyphus - Ultraworker",
           },
         },
       },
@@ -395,7 +395,7 @@ describe("createEventHandler - model fallback", () => {
             content: [],
             modelID: "claude-opus-4-6",
             providerID: "quotio",
-            agent: "Sisyphus (Ultraworker)",
+            agent: "Sisyphus - Ultraworker",
             path: { cwd: "/tmp", root: "/tmp" },
           },
         },
@@ -597,7 +597,7 @@ describe("createEventHandler - model fallback", () => {
             parentID: "msg_user_disabled_1",
             modelID: "claude-opus-4-6-thinking",
             providerID: "anthropic",
-            agent: "Sisyphus (Ultraworker)",
+            agent: "Sisyphus - Ultraworker",
             path: { cwd: "/tmp", root: "/tmp" },
             cost: 0,
             tokens: { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } },

src/plugin/event.test.ts

@@ -771,7 +771,7 @@ describe("createEventHandler - retry dedupe lifecycle", () => {
 						role: "user",
 						modelID: "claude-opus-4-6-thinking",
 						providerID: "anthropic",
-						agent: "Sisyphus (Ultraworker)",
+						agent: "Sisyphus - Ultraworker",
 					},
 				},
 			},

src/plugin/fallback.cliproxyapi-matrix.test.ts

@@ -255,7 +255,7 @@ async function primeMainSession(
           content: [],
           modelID: PRIMARY_MODEL.modelID,
           providerID: PRIMARY_MODEL.providerID,
-          agent: "Sisyphus (Ultraworker)",
+          agent: "Sisyphus - Ultraworker",
           path: { cwd: "/tmp", root: "/tmp" },
         },
       },
@@ -337,7 +337,7 @@ async function triggerAssistantMessageError(
           model: PRIMARY_MODEL_STRING,
           modelID: PRIMARY_MODEL.modelID,
           providerID: PRIMARY_MODEL.providerID,
-          agent: "Sisyphus (Ultraworker)",
+          agent: "Sisyphus - Ultraworker",
           path: { cwd: "/tmp", root: "/tmp" },
           error: {
             statusCode: 529,

src/plugin/ultrawork-model-override.test.ts

@@ -174,7 +174,7 @@ describe("resolveUltraworkOverride", () => {
     const output = createOutput("ulw do something")
 
     //#when
-    const result = resolveUltraworkOverride(config, "Sisyphus (Ultraworker)", output)
+    const result = resolveUltraworkOverride(config, "Sisyphus - Ultraworker", output)
 
     //#then
     expect(result).toEqual({ providerID: "anthropic", modelID: "claude-opus-4-6", variant: "max" })
@@ -408,7 +408,7 @@ describe("applyUltraworkModelOverrideOnMessage", () => {
     const tui = createMockTui()
 
     //#when
-    applyUltraworkModelOverrideOnMessage(config, "Sisyphus (Ultraworker)", output, tui)
+    applyUltraworkModelOverrideOnMessage(config, "Sisyphus - Ultraworker", output, tui)
 
     //#then
     expect(dbOverrideSpy).toHaveBeenCalledWith(