Merge branch 'main' into policy/scope-golangci-rule-to-vendored-copies

Stated unqualified, the rule forbade an agent from modifying
.golangci.yml anywhere, including the canonical copy in this repo --
the only place it can be fixed. Compliance and remediation were
mutually exclusive.

Scope the prohibition to the vendored copy in a consuming repo, which
is the property the rule exists to protect, and name the one legitimate
path for change: a PR against canonical here, merged only by the user.

.golangci.yml

@@ -13,6 +13,7 @@ linters:
   disable:
     # Genuinely incompatible with project patterns
     - exhaustruct      # Requires all struct fields
+    - depguard         # Dependency allow/block lists
     - godot            # Requires comments to end with periods
     - wsl              # Deprecated, replaced by wsl_v5
     - wrapcheck        # Too verbose for internal packages
@@ -27,32 +28,6 @@ linters:
       max-complexity: 15
     dupl:
       threshold: 100
-    depguard:
-      # Test-support code must not be compiled into the shipped binary. A
-      # test-support package exists to hand a test privileges the program
-      # itself must never have, so a file that is not a test must not import
-      # one. Test files, and the files inside a package whose directory name
-      # ends in `test`, are where that code belongs, and are exempt.
-      #
-      # The deny list below is the one part of this file a repository is
-      # expected to extend, and the only part it may. depguard matches an
-      # import path against a list of prefixes, so it cannot be told "any path
-      # whose last segment ends in test"; a repository's own test-support
-      # packages have to be named here one at a time, by full import path,
-      # under a module path that differs from repository to repository. Add
-      # them; change nothing else.
-      rules:
-        test-support:
-          list-mode: lax
-          files:
-            - "$all"
-            - "!$test"
-            - "!**/*test/**"
-          deny:
-            - pkg: net/http/httptest
-              desc: >-
-                Test-support code belongs in test files and in packages whose
-                directory name ends in test, not in the shipped binary.
 
 issues:
   max-issues-per-linter: 0

prompts/REPO_POLICIES.md

@@ -269,11 +269,7 @@ style conventions are in separate documents:
   byte-identical, so that no repo can quietly loosen its own linting. Linter
   configuration changes are made to the canonical copy in the `prompts` repo and
   reach consuming repos by re-vendoring; an agent may open a PR against
-  canonical, which only the user merges. One list is exempt from byte-identity,
-  because it cannot be written once for every repo: the `deny` list of the
-  `test-support` depguard rule, where a repo names its own test-support packages
-  by full import path. A repo adds entries there and changes nothing else, and a
-  re-vendor carries its entries forward. The canonical golangci-lint version is
+  canonical, which only the user merges. The canonical golangci-lint version is
   v2.12.2 (released 2026-05-06), installed commit-pinned via
   `go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@c0d3ddc9cf3faa61a4e378e879ece580256d76e5`.