feat: slice 1 - the neckbeard framework chain runs end to end

Tracer bullet of the migration design (Gate 4, slice 1): pinned v0.1.1
baseline under docs/sources/upstream/ with provenance note, the
Karpathy block moved verbatim to docs/sources/regelwerk/ (standing
rule mapped onto the sources read-only mechanism), AGENTS.md assembled
from the byte-true upstream sections plus the project section 6
(group rules condensed from the old CLAUDE.md), CLAUDE.md reduced to
the upstream pointer, WORKFLOW.md and all four templates copied,
schema.yaml extended (issue milestone/priority/status columns,
component type, wiki area vision - all flagged in the header),
validate.py and gen_status.py forked with marked extensions,
pruefe_upstream_drift.py added, STATUS.md generated, CI gains the
offline validate job, README directory link defused.

Verified: validate 0 errors 0 warnings (the three pre-existing
directory-link errors are gone), gen_status --check current,
drift check 0 findings, baseline byte-identical to the reference
checkout (10/10 files), four negative tests fire (WIP limit 3x
in-progress, waiting without wartegrund, component slug mismatch,
single-byte drift in WORKFLOW.md). gen_status needs Python >= 3.10
locally (write_text newline) - noted for the design AAR.

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

docs/aar/template.md

@@ -0,0 +1,34 @@
+---
+type: aar
+status: open            # open | harvested
+date: YYYY-MM-DD
+related: []             # design docs, issues, ADRs involved
+---
+
+<!-- Copy to docs/aar/YYYY-MM-DD-slug.md. Delete comments when filling in.
+     Standalone AARs are for incidents and major deviations only —
+     normal undertakings get their AAR as Gate 5 inside the design doc. -->
+
+# AAR: Title
+
+## What was planned / expected
+
+## What happened
+
+<!-- Facts and timeline, not blame. -->
+
+## Why the difference
+
+<!-- Root cause. For failures, name the routing class:
+     intent issue / spec issue / code issue. -->
+
+## Learnings
+
+<!-- What future-you should know. Blunt beats polite. -->
+
+## Actions
+
+<!-- Concrete: wiki pages updated (FAQ, Stolpersteine) with links,
+     framework issues opened, tests added. When all actions are done,
+     set status: harvested. The refinement session walks all AARs
+     still marked open. -->