AFI parity: generate the matrix from conformance probes, not prose

The per-adapter parity table was hand-maintained prose. An adapter that
never wired a capability (FastAPI SSR, Axum WebSocket) got its gap
relabelled "Django-only" or "out of scope — use native equivalents," and
nothing went red. The de-scope was crystallized in five mutually-ratifying
sites: the README §Stack-extensions table, the AFI fixture docstring
("channels/forms/shapes aren't AFI-common"), the core registry's
extension-hook framing, the mizan-fastapi __init__ docstring, and a
"CSRF is Django-only" comment in two adapters' session endpoints.

Replace prose-parity with conformance-generated parity:

- tests/afi/manifest.py declares the AFI-common surface as data — one list
  of capabilities, one of adapters. Applicability ("—") is derived from
  transport, never typed.
- tests/afi/probes.py independently inspects each backend's source for the
  artifact a capability requires (comment-stripped, backend-scoped). Green
  means wired; a cell can't be set by editing a word.
- tests/afi/test_capability_parity.py asserts every (capability × applicable
  adapter) pair is wired. 35 unwired gaps are now loud red TFDD tests, each
  naming an owed binding. No xfail/skip.
- tests/afi/parity_table.py generates the README table from the probes;
  `make parity-check` fails CI on any hand-edit, like the codegen byte-parity.

Purge the five de-scope sites. The IR byte-parity gate is unchanged and green.
`make test-afi` is now intentionally red on the 35 gaps — that board is the
owed parity work, itemized; a gap turns green by being wired, never described.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: install test test-core test-django test-fastapi test-react test-afi test-integration docker-up docker-down clean
+.PHONY: install test test-core test-django test-fastapi test-react test-afi parity-table parity-check test-integration docker-up docker-down clean
 
 CORE = cores/mizan-python
 DJANGO = backends/mizan-django
@@ -30,11 +30,24 @@ test-fastapi:
 test-react:
 	cd $(REACT) && npm test
 
-# AFI conformance — verifies mizan-django and mizan-fastapi emit equivalent
-# schemas for the same @client fixture. Substrate-level gate, not e2e.
+# AFI conformance — two gates, substrate-level, not e2e:
+#   test_codegen_parity.py   — Django/FastAPI/Rust emit byte-identical KDL IR.
+#   test_capability_parity.py — every (capability, applicable adapter) pair is
+#                               probed for its wiring. RED on every unwired gap
+#                               by design: that board is the owed work, itemized.
 test-afi:
 	cd $(AFI) && uv run pytest
 
+# Regenerate the README parity table from the live conformance probes. The table
+# is generated output — never hand-edited.
+parity-table:
+	cd $(AFI) && uv run python parity_table.py --write
+
+# CI gate: the committed README parity table matches what the probes report.
+# Fails on any hand-edit, the same forcing function as the codegen byte-parity.
+parity-check:
+	cd $(AFI) && uv run python parity_table.py --check
+
 # ─── Integration Tests ──────────────────────────────────────────────────────
 
 test-integration: docker-up