feat(fase6): gate-promote approved verdicts back into the OKF wiki (Steg 8)

Close the last agentic-loop seam (målbilde §3/§6/§7/§11 step 6): an
APPROVED verdict is promoted from the raw output layer into the context
layer (the OKF bundle) as a navigable `type: verdict` concept file, so
human/persona-approved knowledge reaches the next run's hypothesis.

- okf.py (pure stdlib, MAF-free): render_frontmatter / write_concept_file
  / link_in_index — the D7-portable OKF write counterpart of navigate.
- verdicts.py: promote_verdict + PromotionRefused gate (fail-closed; only
  approved decisions enter the wiki, never raw agent output), provenance
  stamp (who/experiment/when; timestamp a required kwarg), neutral index
  label (signal reaches a prompt only via the gated ExpeL fold, never
  bundle_context), _safe_filename_token (id sanitised for path/link).
- R4 = optional+gated: a public opt-in primitive, NOT wired into
  run_project (mirrors write_verdict — the system reads, the gate promotes).
- Load-bearing trio (test_step8_promotion_loadbearing.py): gate refuses a
  non-approved verdict, approved verdict is navigable, promoted signal
  stays out of the read-context — all proven RED-on-detach. Suite 144->148.

Design hardened by an adversarial plan-critic (12 findings; the BLOCKER —
index-link leak into bundle_context via index_summary — closed by the
neutral label + a no-leak test). Honesty limits documented: promoted file
is minimal (signal as prose only), and the learning-key id means
same-candidate approvals share a filename (last-write-wins).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MHR8iKxJRxDiDfNw8HZmWE

src/portfolio_optimiser/verdicts.py

@@ -20,6 +20,7 @@ from __future__ import annotations
 
 import hashlib
 import json
+import re
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Any
@@ -354,3 +355,90 @@ def seed_store_from_bundle(bundle_dir: str) -> VerdictStore:
         for vf in bundle.verdicts
     ]
     return VerdictStore(verdicts=verdicts)
+
+
+# --- Gated wiki-promotion (Fase 6, Steg 8): output layer -> context layer, HITL-gated ------------
+# målbilde §3 (promoterings-gate) / §6 (kun godkjent kunnskap, aldri rå agent-output; provenance) /
+# §7 (load-bearing: a non-approved verdict must NOT reach the wiki). R4 = optional+gated: this is a
+# PUBLIC opt-in primitive, deliberately NOT wired into run_project — the system reads context; the
+# gate/persona promotes (mirrors write_verdict's role split).
+
+_APPROVED_DECISIONS = frozenset({"approved", "approved_with_adjustment"})
+# A FIXED neutral index label carrying NO verdict signal. link_in_index folds it into index.md ->
+# index_summary -> bundle_context verbatim, so passing the rationale here would leak the realization
+# signal into the read-context on a path that bypasses the gate (målbilde §3/§6). Load-bearing:
+# test_step8 Test C goes red if this is replaced by the rationale.
+_PROMOTED_LINK_LABEL = "Promotert ekspert-vurdering (gated)"
+
+
+class PromotionRefused(Exception):
+    """The gate (målbilde §6): a non-approved verdict was offered for promotion. Fail-closed — the
+    wiki receives ONLY human/persona-approved knowledge, never raw agent output (self-contamination).
+    """
+
+
+def _safe_filename_token(verdict_id: str) -> str:
+    """Turn a verbatim ``Verdict.id`` (arbitrary author string — sentinels, hashes, anything) into a
+    filename/link-safe token: keep ``[A-Za-z0-9._-]``, replace the rest with ``-``. A token that is
+    only separators/dots (degenerate, e.g. ``".."``) falls back to a content hash. This prevents an
+    id with ``/`` (an unnavigable link) or ``..`` from steering the written path — defense beside
+    ``write_concept_file``'s fail-closed ``safe_resolve``. The original id is kept in frontmatter."""
+    token = re.sub(r"[^A-Za-z0-9._-]", "-", verdict_id)
+    if not token.strip(".-_"):
+        return hashlib.sha256(verdict_id.encode("utf-8")).hexdigest()[:16]
+    return token
+
+
+def promote_verdict(
+    bundle_dir: str,
+    verdict: Verdict,
+    *,
+    approver: str,
+    experiment: str,
+    timestamp: str,
+) -> Path:
+    """Promote an APPROVED verdict from the raw output layer into the OKF context layer (the wiki) as
+    a ``type: verdict`` concept file, navigable by the next run's ``seed_store_from_bundle`` (Steg 8,
+    målbilde §3/§6/§7). GATE (fail-closed): a verdict whose ``decision`` is not an approval raises
+    ``PromotionRefused`` and writes/links NOTHING — only human/persona-approved knowledge enters the
+    wiki. Provenance-stamped (who/which-experiment/when). ``timestamp`` is a required keyword (no
+    wall-clock default) so promotion is deterministic and the stamp reproducible.
+
+    The promoted file is MINIMAL: it does NOT reproduce the hand-authored seed's structured fields
+    (``realization_rate`` etc.) — the raw ``Verdict`` model carries the learning signal only as
+    ``rationale`` prose, which becomes the ``description`` frontmatter ``seed_store_from_bundle``
+    folds into ExpeL. The index link uses a NEUTRAL label (``_PROMOTED_LINK_LABEL``), so the signal
+    reaches a prompt only via the gated fold, never via ``bundle_context`` (§3/§6).
+
+    Known limitation (mirrors ``write_verdict``): ``_mint_id`` keys on the candidate features, so two
+    approved verdicts about the SAME candidate share an id -> share a filename -> last-write-wins;
+    the wiki grows one curated verdict file per distinct candidate measure, not per verdict event.
+    Returns the written path."""
+    if verdict.decision not in _APPROVED_DECISIONS:
+        raise PromotionRefused(
+            f"refusing to promote a non-approved verdict (decision={verdict.decision!r}); "
+            "only human/persona-approved knowledge enters the wiki (målbilde §6)"
+        )
+    f = verdict.proposal_features
+    frontmatter = {
+        "type": "verdict",
+        "decision": verdict.decision,
+        "description": verdict.rationale,
+        "verdict_id": verdict.id,
+        "provenance": f"godkjent av {approver}; eksperiment {experiment}; {timestamp}",
+        "timestamp": timestamp,
+        "tags": "[verdict, promoted, HITL]",
+    }
+    codes = ", ".join(sorted(f.affected_codes))
+    body = (
+        "# Promotert ekspert-vurdering\n\n"
+        f"{verdict.rationale}\n\n"
+        f"- Tiltak: {f.measure_type}\n"
+        f"- Berørte koder: {codes}\n"
+        f"- Beslutning: {verdict.decision}\n"
+        f"- Provenance: {frontmatter['provenance']}\n"
+    )
+    filename = f"promoted-verdict-{_safe_filename_token(verdict.id)}.md"
+    path = okf.write_concept_file(bundle_dir, filename, frontmatter, body)
+    okf.link_in_index(bundle_dir, filename, _PROMOTED_LINK_LABEL)
+    return path