feat(learning-harness): absence rows travel with their registration

Eight of the ten vendored access-control rows had no named handler at all,
so every one of them would have scored `missing_context` forever rather
than as a detector miss. After the re-harvest nine are named and the tenth
states its reason.

The handler-context mode now carries the class its framework registers,
multi-line decorators, and commented-out guards -- `#@token_required`
above a ThreatByte handler is the entire bug. Where the registration lives
in another document (connexion's `operationId`, an express router), a
recipe names `context = [...]`, the harvester writes that stanza per side,
and the pair materializes both files at their repository-relative paths so
the entry-point mapper sees the layout the project has. `harvest_recipe`
fetches every blob before the first write and the driver takes `--report`,
so a failed fetch leaves a reviewed excerpt exactly as it was.

Two defects the re-harvest exposed: `.mjs` was not a known suffix, so the
one pair vendored as an ES module had no file target at all; and
`_python_route_access` matched auth words inside decorator prose, reading
`@ns.doc(description='... without proper authorization checks')` as a
guard. Recorded in the hygiene artifact: nine of the ten duplicate groups
sit on both sides of the split, which the repository-level split cannot
see.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG

benchmarks/pairs/vibe-py/vampi-users-update-password/context/fixed/openapi_specs/openapi3.yml

@@ -0,0 +1,55 @@
+# Provenance: erev0s/VAmPI update_password (fixed).
+# repo: erev0s/VAmPI
+# commit: 1713b54b601ad29582581eeda4b31fceb1319874
+# parent: 1713b54b601ad29582581eeda4b31fceb1319874
+# commit_url: https://github.com/erev0s/VAmPI/blob/1713b54b601ad29582581eeda4b31fceb1319874/api_views/users.py#L187
+# cve: 
+# license: MIT
+# function: update_password
+# relpath: openapi_specs/openapi3.yml
+# provenance: human
+# mechanism: missing_auth_guard
+
+paths:
+  /users/v1/register:
+    post:
+      tags:
+        - users
+      summary: Register new user
+      description: Register new user
+      operationId: api_views.users.register_user
+      requestBody:
+        description: Username of the user
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                username:
+                  type: string
+                  example: 'name1'
+                password:
+                  type: string
+                  example: 'pass1'
+                email:
+                  type: string
+                  example: '[email protected]'
+        required: true
+      responses:
+        '200':
+          description: Successfully created user
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  message:
+                    type: string
+                    example: 'Successfully registered. Login to receive an auth token.'
+                  status:
+                    type: string
+                    enum: ['success', 'fail']
+                    example: 'success'
+        '400':
+          description: Invalid request
+          content: {}

benchmarks/pairs/vibe-py/vampi-users-update-password/context/vuln/openapi_specs/openapi3.yml

@@ -0,0 +1,73 @@
+# Provenance: erev0s/VAmPI update_password (vuln).
+# repo: erev0s/VAmPI
+# commit: 1713b54b601ad29582581eeda4b31fceb1319874
+# parent: 1713b54b601ad29582581eeda4b31fceb1319874
+# commit_url: https://github.com/erev0s/VAmPI/blob/1713b54b601ad29582581eeda4b31fceb1319874/api_views/users.py#L187
+# cve: 
+# license: MIT
+# function: update_password
+# relpath: openapi_specs/openapi3.yml
+# provenance: human
+# mechanism: missing_auth_guard
+
+paths:
+  /users/v1/{username}/password:
+    put:
+      security:
+        - bearerAuth: [ ]
+      tags:
+        - users
+      summary: Update users password
+      description: Update users password
+      operationId: api_views.users.update_password
+      parameters:
+        - name: username
+          in: path
+          description: username to update password
+          required: true
+          schema:
+            type: string
+            example: 'name1'
+      requestBody:
+        description: field to update
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                password:
+                  type: string
+                  example: 'pass4'
+        required: true
+      responses:
+        '204':
+          description: Successfully updated users password
+          content: {}
+        '400':
+          description: Invalid request
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  status:
+                    type: string
+                    enum: ['fail']
+                    example: 'fail'
+                  message:
+                    type: string
+                    example: 'Malformed Data'
+        '401':
+          description: User not authorized
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  status:
+                    type: string
+                    enum: ['fail']
+                    example: 'fail'
+                  message:
+                    type: string
+                    example: 'Invalid token. Please log in again.'

benchmarks/pairs/vibe-py/vampi-users-update-password/fixed.py

@@ -9,6 +9,7 @@
 # relpath: api_views/users.py
 # provenance: human
 # mechanism: missing_auth_guard
+# upstream_start: 52
 
 def register_user():
     request_data = request.get_json()

benchmarks/pairs/vibe-py/vampi-users-update-password/vuln.py

@@ -9,6 +9,7 @@
 # relpath: api_views/users.py
 # provenance: human
 # mechanism: missing_auth_guard
+# upstream_start: 179
 
 def update_password(username):
     request_data = request.get_json()