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

kb/concepts/COLLECTION.md

@@ -27,19 +27,27 @@ tone, relationship labels, the confidence rubric. Neither is restated here.
 
 `concept` (`tools/wikitool types describe concept`).
 
-## Decisions and ADRs
+## Decisions
 
-An architectural decision is a concept page, prefixed as
-[kb/CONVENTIONS.md § Naming](../CONVENTIONS.md#naming) says. It records:
+An architectural decision is an ordinary concept page with `concept_type: decision`
+(`tools/wikitool types describe concept`) - not a separate format, and not a separate location.
+There is no `adr-NNN-`-prefixed filename and no dedicated directory: naming follows
+[kb/CONVENTIONS.md § Naming](../CONVENTIONS.md#naming) like every other concept, and the page
+lives in `kb/concepts/` like every other concept.
 
-- **Context** - what forced a decision.
-- **Decision** - what was chosen.
-- **Consequences** - what this costs, not only what it buys.
-- **Status** - proposed / accepted / deprecated / superseded.
-- Links to every entity the decision affects.
+The body is organic prose under this collection's usual sections, not a fixed template. What it
+still has to carry: what was decided, what forced the decision, what it costs (not only what it
+buys), and a link to every entity the decision affects. A `**Status:**` line is optional - most
+decision pages in this instance carry none, because the page's own prose already says whether the
+decision stands.
 
-A superseded ADR is never deleted or rewritten. The new one declares `supersedes` pointing at
-it; the old one needs no edge back, because its inbound view renders the replacement.
+A decision superseded by a later one is never deleted or rewritten. The new page declares
+`supersedes` pointing at it; the old one needs no edge back, because its inbound view renders the
+replacement.
+
+`concept_type: decision` is also the one subtype [kb/CONTRACT.md](../CONTRACT.md)'s confidence
+machinery treats differently: `confidence decay` skips it structurally, because elapsed time does
+not falsify a decision - only a later decision superseding it does.
 
 ## Authorised labels