test(pipeline): the checks of the pure pipeline

Stream, Normalize, Merge, Dispositions, Config, CodeKeys and the pure half
of CommitsMode, each a test of its own (131 checks). The fixture rewrites
are checked in (code-keys/<name>/, commits3/), so the suite reads fixtures
and edits nothing. The allowlist, command-line and MCP checks of
CommitsMode come with the pool they test.

Among them: this binary's `<exe> sql` spelling counts as a SQL call, and a
result line with a raw U+2028 in a JSON string is still the result line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/Goldens/fixture/commits3/0001-add-the-greeting-module.patch

@@ -0,0 +1,30 @@
+From 1111111111111111111111111111111111111111 Mon Sep 17 00:00:00 2001
+From: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
+Date: Wed, 24 Sep 2026 10:00:00 +0200
+Subject: [PATCH 1/3] add the greeting module
+
+---
+ hello.py | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+ create mode 100644 hello.py
+
+diff --git a/hello.py b/hello.py
+new file mode 100644
+index 0000000..a1b2c3d
+--- /dev/null
++++ b/hello.py
+@@ -0,0 +1,9 @@
++"""Greetings."""
++
++
++def greet():
++    return "hello"
++
++
++def farewell():
++    return "bye"
+
+base-commit: 0000000000000000000000000000000000000000
+-- 
+2.51.0
+

tests/Goldens/fixture/commits3/0002-greet-by-name-and-document-it.patch

@@ -0,0 +1,55 @@
+From 2222222222222222222222222222222222222222 Mon Sep 17 00:00:00 2001
+From: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
+Date: Wed, 24 Sep 2026 10:05:00 +0200
+Subject: [PATCH 2/3] greet by name and document it
+
+The greeting takes a name now and the farewell mirrors it; the README
+documents both calls. Callers that pass nothing still get the old text.
+
+The format follows the greeting spec [1].
+
+[1] https://example.org/greeting-spec
+---
+ README.md | 4 ++++
+ hello.py  | 8 ++++++--
+ 2 files changed, 10 insertions(+), 2 deletions(-)
+ create mode 100644 README.md
+
+diff --git a/README.md b/README.md
+new file mode 100644
+index 0000000..d4e5f6a
+--- /dev/null
++++ b/README.md
+@@ -0,0 +1,4 @@
++# hello
++
++Call `greet(name)` or `farewell(name)`; without a name both return the
++plain text.
+diff --git a/hello.py b/hello.py
+index a1b2c3d..b7c8d9e 100644
+--- a/hello.py
++++ b/hello.py
+@@ -1,9 +1,13 @@
+ """Greetings."""
+ 
+ 
+-def greet():
+-    return "hello"
++def greet(name=None):
++    if name is None:
++        return "hello"
++    return "hello " + name
+ 
+ 
+@@ -7,3 +11,5 @@ def greet():
+-def farewell():
+-    return "bye"
++def farewell(name=None):
++    if name is None:
++        return "bye"
++    return "bye " + name
+
+base-commit: 0000000000000000000000000000000000000000
+-- 
+2.51.0
+

tests/Goldens/fixture/commits3/0003-add-tests.patch

@@ -0,0 +1,24 @@
+From 3333333333333333333333333333333333333333 Mon Sep 17 00:00:00 2001
+From: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
+Date: Wed, 24 Sep 2026 10:10:00 +0200
+Subject: [PATCH 3/3] add tests
+
+Tests for greet.
+---
+ tests/test_hello.py | 3 +++
+ 1 file changed, 3 insertions(+)
+ create mode 100644 tests/test_hello.py
+
+diff --git a/tests/test_hello.py b/tests/test_hello.py
+new file mode 100644
+index 0000000..1111111
+--- /dev/null
++++ b/tests/test_hello.py
+@@ -0,0 +1,3 @@
++from hello import greet
++def test_greet():
++    assert greet("x") == "hello x"
+
+base-commit: 0000000000000000000000000000000000000000
+-- 
+2.51.0