test(v1-gate): harden the gate against a handwritten green

An independent review made rows 1, 2 and 4 green from a handwritten
directory in a minute, and 10 of 20 mutants survived the gate's tests.

Rounds now need a new point and their own ids, a timezone-aware given_at
in order, and a report the feedback was given on; every outcome must name
a run whose own coverage confirms (a)-(d), the feedback must fall between
the two runs, and a NOK change under 1 % is noise. Row 4 counts content
lines kept unchanged and in order, shows the expert's additions, and calls
a byte-identical copy untouched unless round 3 acknowledges it. Row 6
counts the runs' own proposals. Types 3 and 7 are proven through the real
flags with the action in the result (still 3 of 8). The contract numbers
and the evidence register are pinned to their source. Every run prints
that rows 1-2 cannot prove who wrote the feedback. A rounds directory
inside the repo that git would commit, and a missing stress or bundle
root, are usage errors.

The review's 20 mutants, re-run: 20 of 20 killed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/portfolio_optimiser/evals/v1_gate.json

@@ -15,7 +15,10 @@
     },
     "3": {
       "label": "vinklinger - nye vinklinger",
-      "evidence": ["tests/test_mandate_cli.py::test_run_settles_against_the_mandate_afterwards"]
+      "evidence": [
+        "tests/test_v1_probes.py::test_type_3_a_commissioned_angle_is_evaluated_through_the_cli",
+        "tests/test_v1_probes.py::test_type_3_a_new_angle_changes_the_outcome"
+      ]
     },
     "4": {
       "label": "lette paa krav",
@@ -32,7 +35,7 @@
     "7": {
       "label": "MCP - verktoey i debatten",
       "evidence": [
-        "tests/test_mcp_run_loadbearing.py::test_configured_server_becomes_a_tool_the_agents_have",
+        "tests/test_v1_probes.py::test_type_7_the_mcp_flag_puts_a_service_the_run_calls_into_the_result",
         "tests/test_b4_mcp_call_trace_loadbearing.py::test_a_called_mcp_tool_is_recorded_in_provenance"
       ]
     },