feat(toolbox): the seven outbox writers get their own door -- row 1 moves 8 -> 15 of 17

Every one of the run path's seven `outbox.write_*` steps was reachable only through
`run.main`, and every path through that builds a chat client. The steps need no model:
they take already-rendered data and put it on disk in a byte-deterministic form.

Seven subcommands, seven thin adapters. The outbox directory is always the caller's to
name -- never a default, never the repository's own, because a step that wrote into a
folder the framework also reads as an inbox would bypass the Step-8 promotion gate.

`write-outbox` is the one that is not purely mechanical: `outbox.write_outbox` branches
on the outcome TYPE, so a door that took the outcome as an argument would let anyone
author an outbox of claims and hand it to Step 8 as results. The door DERIVES it through
`validate_proposal` -- the run path's own composition -- and a blocked proposal exits 3
with the artefacts still written, since that is where the rejection is recorded.
`verdict_id` stays an argument: `verdict-key` already owns that minting.

`--stop-reason` is required rather than defaulted to the empty string, inheriting the
core writer's measured reason: "the run finished" and "we never found out" must not be
the same value.

Eight probes, each a subprocess with the subcommand in argv, each asserting on the FILE
the command wrote. The ground truth is composed in the test -- the payload it wrote and
counted itself, and the byte form the contract requires -- never `outbox._dump`, which
would have measured the module against itself. The refusal arm carries its rc-0 control.

Measured, own run of the B gate: row 1 8 of 17 -> 15 of 17, exit 1 unchanged, no other
row moved. 0 chat-client names reachable from the toolbox (known-positive control: 24 in
run.py).

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

src/portfolio_optimiser/evals/b_gate.json

@@ -263,11 +263,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-run-config"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_run_config_from_outside_is_the_byte_deterministic_artefact"
+      ]
     },
     {
       "id": "coverage",
@@ -279,11 +282,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-coverage"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_coverage_from_outside_keeps_every_row_and_the_stop_reason"
+      ]
     },
     {
       "id": "utboks",
@@ -295,11 +301,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-outbox"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_outbox_from_outside_writes_the_pair_the_run_path_writes"
+      ]
     },
     {
       "id": "rundebinding",
@@ -365,11 +374,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-prepass"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_prepass_from_outside_records_the_cut_the_run_was_given"
+      ]
     },
     {
       "id": "parse-feil",
@@ -381,11 +393,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-parse-failures"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_parse_failures_from_outside_keeps_every_reply_that_did_not_parse"
+      ]
     },
     {
       "id": "forslagsvurderinger",
@@ -397,11 +412,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-proposal-reviews"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_proposal_reviews_from_outside_states_an_empty_review_list"
+      ]
     },
     {
       "id": "debatt-verktøy",
@@ -413,11 +431,14 @@
         "scope": "run_project"
       },
       "entry": {
-        "kind": "console-script",
-        "module": "run.py",
-        "scope": "main"
+        "kind": "subcommand",
+        "module": "toolbox.py",
+        "scope": "main",
+        "command": "write-debate-tools"
       },
-      "probe": []
+      "probe": [
+        "tests/test_toolbox_outbox_doors.py::test_write_debate_tools_from_outside_writes_an_empty_trace_as_a_statement"
+      ]
     }
   ],
   "roles": {