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/cli/run/runner.test.ts

@@ -31,7 +31,7 @@ describe("resolveRunAgent", () => {
     )
 
     // then
-    expect(agent).toBe("Hephaestus (Deep Agent)")
+    expect(agent).toBe("Hephaestus - Deep Agent")
   })
 
   it("uses env agent over config", () => {
@@ -43,7 +43,7 @@ describe("resolveRunAgent", () => {
     const agent = resolveRunAgent({ message: "test" }, config, env)
 
     // then
-    expect(agent).toBe("Atlas (Plan Executor)")
+    expect(agent).toBe("Atlas - Plan Executor")
   })
 
   it("uses config agent over default", () => {
@@ -54,7 +54,7 @@ describe("resolveRunAgent", () => {
     const agent = resolveRunAgent({ message: "test" }, config, {})
 
     // then
-    expect(agent).toBe("Prometheus (Plan Builder)")
+    expect(agent).toBe("Prometheus - Plan Builder")
   })
 
   it("falls back to sisyphus when none set", () => {
@@ -65,7 +65,7 @@ describe("resolveRunAgent", () => {
     const agent = resolveRunAgent({ message: "test" }, config, {})
 
     // then
-    expect(agent).toBe("Sisyphus (Ultraworker)")
+    expect(agent).toBe("Sisyphus - Ultraworker")
   })
 
   it("skips disabled sisyphus for next available core agent", () => {
@@ -76,18 +76,18 @@ describe("resolveRunAgent", () => {
     const agent = resolveRunAgent({ message: "test" }, config, {})
 
     // then
-    expect(agent).toBe("Hephaestus (Deep Agent)")
+    expect(agent).toBe("Hephaestus - Deep Agent")
   })
 
   it("maps display-name style default_run_agent values to canonical display names", () => {
     // given
-    const config = createConfig({ default_run_agent: "Sisyphus (Ultraworker)" })
+    const config = createConfig({ default_run_agent: "Sisyphus - Ultraworker" })
 
     // when
     const agent = resolveRunAgent({ message: "test" }, config, {})
 
     // then
-    expect(agent).toBe("Sisyphus (Ultraworker)")
+    expect(agent).toBe("Sisyphus - Ultraworker")
   })
 })