chore: tune challenge matrix and debug prompts

docs/AGENTS.md

@@ -84,6 +84,14 @@ this line ends the list, because it has no indents.
 ```
 
 2. otherwise this will be "fixed" and renumbered to 1.
+
+<!-- in case -->
+9. we have come far
+   - notice the indents
+<!-- a blank line here is standard -->
+10. after this point
+    - the indent increases
+    - since the list marker is longer
 ````
 
 ### why not prettier? it does much more

examples/agent_challenges/browser_click_challenge/challenge-prompt.md

@@ -92,7 +92,7 @@ challenge_report:
     failed: 0
   missed_requirements:
     - "none"
-  ux_issues_found: []
+  # Debug profile only: include ux_issues_found here. See the debug profile instructions.
   notes: "short explanation"
 ```
 
@@ -123,8 +123,6 @@ Reporting rules:
   abandoned workflow plans.
 - `attempts.failed` should count attempts that failed validation, failed to run,
   produced wrong output, or were abandoned.
-- `ux_issues_found` should always be present. Use an empty list when you found
-  no UX issues; otherwise include concrete command/error/workaround notes.
 
 Spawned subagents count as you. If a subagent reads product code, set
 `read.product_code: true`. If a subagent reads prior attempts, set

examples/agent_challenges/names.py

@@ -4,9 +4,12 @@ from __future__ import annotations
 def short_model_name(model: str) -> str:
     """Return compact model labels for dense trial tables and session titles."""
     name = model.rsplit("/", 1)[-1]
-    for suffix in ("-v4-flash-free", "-v2.5-free", "-3-ultra-free"):
-        name = name.replace(suffix, "")
-    return name
+    return {
+        "deepseek-v4-flash-free": "deepseek",
+        "mimo-v2.5-free": "mimo",
+        "nemotron-3-ultra-free": "nemotron",
+        "north-mini-code-free": "north",
+    }.get(name, name)
 
 
 def short_challenge_name(challenge: str) -> str:

examples/agent_challenges/profile-prompts/debug.md

@@ -23,8 +23,10 @@ honestly in the `read` flags and explain why. Never read or copy adjacent trial
 answers, prior result files, prior stores, or complete ready-made solution plans
 for the same challenge.
 
-In the final `challenge_report`, include a `ux_issues_found` list. Use an empty
-list if there were no issues. Each issue should be concrete and evidence-backed:
+For this debug profile only, extend the final `challenge_report` YAML with a
+top-level `ux_issues_found` list next to `missed_requirements` and `notes`. Use
+an empty list if there were no issues. Each issue should be concrete and
+evidence-backed:
 
 ```yaml
 ux_issues_found:

examples/agent_challenges/report_workflow_challenge/challenge-prompt.md

@@ -92,7 +92,7 @@ challenge_report:
     failed: 0
   missed_requirements:
     - "none"
-  ux_issues_found: []
+  # Debug profile only: include ux_issues_found here. See the debug profile instructions.
   notes: "short explanation"
 ```
 
@@ -127,8 +127,6 @@ Reporting rules:
   abandoned workflow plans.
 - `attempts.failed` should count attempts that failed validation, failed to run,
   produced wrong output, or were abandoned.
-- `ux_issues_found` should always be present. Use an empty list when you found
-  no UX issues; otherwise include concrete command/error/workaround notes.
 
 Spawned subagents count as you. If a subagent reads product code, set
 `read.product_code: true`. If a subagent reads prior attempts, set

examples/agent_challenges/run_matrix.ps1

@@ -5,8 +5,8 @@ param(
     [int]$TimeoutSeconds = 3600,
     [object[]]$models = @( # object[] because ModelProfile is not known yet
         [ModelProfile]::new("opencode/deepseek-v4-flash-free", "max"),
-        [ModelProfile]::new("opencode/mimo-v2.5-free", "high"),
-        [ModelProfile]::new("opencode/nemotron-3-ultra-free", "high")
+        [ModelProfile]::new("opencode/mimo-v2.5-free", "high")
+        # [ModelProfile]::new("opencode/nemotron-3-ultra-free", "high")
     )
 )
 

examples/agent_challenges/run_matrix.py

@@ -45,7 +45,7 @@ class ModelProfile:
 DEFAULT_MODELS = (
     ModelProfile("opencode/deepseek-v4-flash-free", "max"),
     ModelProfile("opencode/mimo-v2.5-free", "high"),
-    ModelProfile("opencode/nemotron-3-ultra-free", "high"),
+    # ModelProfile("opencode/nemotron-3-ultra-free", "high"),
 )
 
 

tests/examples/test_agent_challenge_harness_v2.py

@@ -127,6 +127,7 @@ def test_challenge_prompt_is_identical_across_profiles(tmp_path: Path) -> None:
     assert ".agent/skills" in rendered[InstructionProfile.SKILLS].text
     assert "inspect broader repository" in rendered[InstructionProfile.ALL].text
     assert "genuinely blocked" in rendered[InstructionProfile.DEBUG].text
+    assert "debug profile only" in rendered[InstructionProfile.DEBUG].text
     assert "ux_issues_found" in rendered[InstructionProfile.DEBUG].text
 
 

tests/examples/test_opencode_browser_click_challenge.py

@@ -950,9 +950,8 @@ def test_browser_click_wrapper_produces_expected_paths_and_command_prefix() -> N
     )
     assert BROWSER_CLICK_DEF.default_prompt.name == "challenge-prompt.md"
     assert BROWSER_CLICK_DEF.default_prompt.parent.name == "browser_click_challenge"
-    assert "ux_issues_found: []" in BROWSER_CLICK_DEF.default_prompt.read_text(
-        encoding="utf-8"
-    )
+    prompt = BROWSER_CLICK_DEF.default_prompt.read_text(encoding="utf-8")
+    assert "Debug profile only: include ux_issues_found here" in prompt
 
 
 def test_generic_runner_can_be_configured_with_fake_challenge_and_fake_opencode(

tests/examples/test_report_workflow_challenge.py

@@ -40,7 +40,7 @@ def test_report_challenge_prompt_requires_full_product_lifecycle() -> None:
     assert "render_markdown_report" in prompt
     assert "deployment" in prompt.lower()
     assert "run_id" in prompt
-    assert "ux_issues_found: []" in prompt
+    assert "Debug profile only: include ux_issues_found here" in prompt
 
 
 def test_report_challenge_workspace_template_contains_safe_input_files(