docs: rebase onto moved main, renumber session ADRs to 0012/0013

Reality moved after the Gate-3 approval (flagged by the human, verified
read-only): main gained decisions/0011 plus a new AAR, gitops gained two
commits, and the live backlog shows gitops#61 without a milestone - the
first real break of the 100% milestone discipline. Session ADRs
renumbered to avoid the id collision, counts updated (11 old ADRs, 6
AARs), gruppenpruefung gains the group-wide milestone/priority duty
check backed by that real case. Addendum in the design doc records all
of it.

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

docs/adr/0012-issues-im-repo-gitlab-als-spiegel.md

@@ -1,6 +1,6 @@
 ---
 type: adr
-id: "0011"
+id: "0012"
 status: accepted
 date: 2026-08-11
 supersedes: null
@@ -11,7 +11,7 @@ related:
   - "decisions/0005-pm-framework-kanban.md"
 ---
 
-# ADR-0011: Issues leben im Repo; GitLab wird deterministisch bespiegelt
+# ADR-0012: Issues leben im Repo; GitLab wird deterministisch bespiegelt
 
 ## Kontext
 

docs/adr/0013-gruppenregeln-kanonisch-mit-pruefung.md

@@ -1,6 +1,6 @@
 ---
 type: adr
-id: "0012"
+id: "0013"
 status: accepted
 date: 2026-08-11
 supersedes: null
@@ -10,7 +10,7 @@ related:
   - "decisions/0001-gitlab-kanonisch-push-mirror.md"
 ---
 
-# ADR-0012: Gruppenregeln kanonisch im management-Repo, Komponenten zeigen und werden geprüft
+# ADR-0013: Gruppenregeln kanonisch im management-Repo, Komponenten zeigen und werden geprüft
 
 ## Kontext