docs/ als ausgelieferter Hintergrund-Ort; Decision-Seiten bleiben in kb/, Decay-Skip fuer concept_type: decision (4.3.0, #38)

Files changed:
- AGENTS.md
- CHANGES.md
- VERSION
- instructions/kb-profiles.md
- kb/CONVENTIONS.md
- kb/concepts/COLLECTION.md
- tools/CONTRACT.md
- tools/chemenu/commands/confidence_decay.py
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/tests/test_confidence_decay.py
- tools/chemenu/tests/test_dist_cmd.py

tools/chemenu/commands/confidence_decay.py

@@ -11,6 +11,14 @@ Keeping the undecayed anchor in `confidence_base` is what makes repeated runs
 idempotent - decaying the stored `confidence` in place (the pre-2026-08-13
 behavior) compounded on every run, because the elapsed-months factor kept
 growing while the multiplicand had already shrunk.
+
+Pages with `concept_type: decision` are skipped structurally, not as an
+interim measure. The formula models staleness - a claim that nobody has
+re-checked in a while becomes less trustworthy - and a decision is not a
+claim about the world that time can falsify. What retires a decision is a
+later decision superseding it, never elapsed months on its own; that is a
+category the decay formula does not have a term for, so it does not apply
+one.
 """
 from __future__ import annotations
 
@@ -118,6 +126,8 @@ def confidence_decay(
     missing_base = []
 
     for title, page in sorted(pages.items()):
+        if page.frontmatter.get("concept_type") == "decision":
+            continue
         confidence = page.frontmatter.get("confidence")
         if confidence is None:
             continue

tools/chemenu/commands/dist_cmd.py

@@ -347,6 +347,12 @@ def build_plan(origin: Optional[Origin] = None) -> dict[str, PlannedFile]:
     for hook_dir in HOOK_DIRS:
         plan.update(_copy_tree(config.ROOT / hook_dir, hook_dir, frozenset()))
 
+    # docs/ is stack background - why the stack is built the way it is - and
+    # ships verbatim like instructions/ and types/: it carries no page, no
+    # frontmatter, and (AGENTS.md § File naming) no normative sentence, so
+    # there is nothing instance-owned in it to split off as a .template.
+    plan.update(_copy_tree(config.ROOT / "docs", "docs", frozenset()))
+
     # `kb/CONTRACT.md` is stack-owned and ships verbatim; everything beside it
     # under `kb/` is the instance's own and ships only as a `.template`. That is
     # the personalization split (`USER.md`/`SOUL.md`) one directory down, and
@@ -492,7 +498,8 @@ def export_command(
 ):
     """Export a contentless, distributable copy of this repo's machinery:
     AGENTS.md/README.md (dev-instance-only marker blocks removed),
-    instructions/ (no instructions/dev/), types/, tools/ (no venv/caches),
+    instructions/ (no instructions/dev/), types/, docs/ verbatim,
+    tools/ (no venv/caches),
     the .github/hooks/+.vibe session-tracing config plus .claude/settings.json,
     kb/CONTRACT.md plus a COLLECTION.md.template per collection and
     kb/CONVENTIONS.md.template (no pages, no areas), empty

tools/chemenu/tests/test_confidence_decay.py

@@ -5,7 +5,7 @@ import pytest
 from chemenu import config
 from chemenu.commands import confidence_decay
 from chemenu.commands.confidence_decay import FLOOR, compute_decay
-from chemenu.frontmatter_io import read_page
+from chemenu.frontmatter_io import read_page, write_page
 
 
 def test_no_decay_at_zero_months():
@@ -68,3 +68,22 @@ def test_decay_skips_pages_without_a_base(decay_wiki):
     confidence_decay.confidence_decay(apply=True)
     frontmatter, _ = read_page(decay_wiki / "entities/systems/aurora.md")
     assert frontmatter["confidence"] == 0.9
+
+
+def test_decay_skips_decision_pages(decay_wiki):
+    """A decision is not falsified by elapsed time, only by a later decision
+    superseding it - `concept_type: decision` is a categorical skip, not
+    something an old `modified` date should ever decay (Gitea #38)."""
+    decision_path = decay_wiki / "concepts" / "some-decision.md"
+    write_page(
+        decision_path,
+        {
+            "type": "types/concept.md", "concept_type": "decision",
+            "tags": [], "created": "2015-01-01", "modified": "2015-01-01",
+            "related": [], "sources": [], "confidence": 0.9, "confidence_base": 0.9,
+        },
+        "\n# some-decision\n",
+    )
+    confidence_decay.confidence_decay(apply=True)
+    frontmatter, _ = read_page(decision_path)
+    assert frontmatter["confidence"] == 0.9

tools/chemenu/tests/test_dist_cmd.py

@@ -135,6 +135,10 @@ def repo(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
         f"<!-- {config.TEMPLATE_SENTINEL} -->\n# conventions template\n", encoding="utf-8"
     )
 
+    docs_dir = root / "docs"
+    docs_dir.mkdir()
+    (docs_dir / "why-gates-are-code.md").write_text("# Why gates are code\n", encoding="utf-8")
+
     for relative in ("raw/CONTRACT.md", "reports/CONTRACT.md", "work/CONTRACT.md"):
         path = root / relative
         path.parent.mkdir(parents=True, exist_ok=True)
@@ -156,6 +160,11 @@ def test_plan_never_includes_commonplace(repo):
     assert "commonplace" not in combined
 
 
+def test_plan_ships_docs_verbatim(repo):
+    plan = dist_cmd.build_plan()
+    assert plan["docs/why-gates-are-code.md"].content == "# Why gates are code\n"
+
+
 def test_plan_never_includes_instructions_dev(repo):
     """instructions/dev/ - flat dev-only instructions and the nested skill
     that switches a session into tool-development mode - is pruned