golangci: set canonical config to the org-standard v2 file, note v2.12.2

.golangci.yml

@@ -1,5 +1,9 @@
 version: "2"
 
+# Config schema uses the golangci-lint v2 layout (settings live under
+# linters.settings, not top-level linters-settings) so that the
+# thresholds below are actually applied by golangci-lint >= v2.
+
 run:
   timeout: 5m
   modules-download-mode: readonly
@@ -12,7 +16,6 @@ linters:
     - depguard         # Dependency allow/block lists
     - godot            # Requires comments to end with periods
     - wsl              # Deprecated, replaced by wsl_v5
-    - gomodguard       # Deprecated, replaced by gomodguard_v2
     - wrapcheck        # Too verbose for internal packages
     - varnamelen       # Short names like db, id are idiomatic Go
   settings:
@@ -25,25 +28,7 @@ linters:
       max-complexity: 15
     dupl:
       threshold: 100
-  exclusions:
-    generated: lax
-    paths:
-      - third_party$
-      - builtin$
-      - examples$
 
 issues:
   max-issues-per-linter: 0
   max-same-issues: 0
-
-formatters:
-  enable:
-    - gofmt
-    - gofumpt
-    - goimports
-  exclusions:
-    generated: lax
-    paths:
-      - third_party$
-      - builtin$
-      - examples$

TODO.md

@@ -21,12 +21,11 @@ fmt-check, and commit.
 
 # Completed Steps
 
-- 2026-08-07: Migrated the canonical `.golangci.yml` to the golangci-lint v2
-  schema via `golangci-lint migrate` under v2.12.2 (settings under
-  `linters.settings`, explicit `exclusions` and `formatters` blocks,
-  `gomodguard` disabled in favor of `gomodguard_v2`; `gci` intentionally not
-  enabled). Recorded the canonical golangci-lint version (v2.12.2,
-  commit-pinned) in REPO_POLICIES.md.
+- 2026-08-07: Set the canonical `.golangci.yml` to the org-standard v2-schema
+  config already deployed byte-identical across the org's Go repos (settings
+  under `linters.settings` so thresholds like lll/funlen/cyclop/dupl actually
+  apply under golangci-lint v2). Recorded the canonical golangci-lint version
+  (v2.12.2, commit-pinned) in REPO_POLICIES.md.
 - 2026-03-20: Strengthened constructor naming and Params struct rules in the Go
   styleguide.
 - 2026-03-18: Documented fail-fast Dockerfile lint stage and conditional -v test