diff --git a/TODO.md b/TODO.md
index e301285..eda1d9d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -8,8 +8,8 @@ Dispatched from core/go orchestration. Pick up tasks in order.
 
 - [x] **Expand ansible/ tests** — Added `parser_test.go` (17 tests: ParsePlaybook, ParseInventory, ParseTasks, GetHosts, GetHostVars, isModule, NormalizeModule), `types_test.go` (RoleRef/Task UnmarshalYAML, Inventory, Facts, TaskResult, KnownModules), `executor_test.go` (getHosts, matchesTags, evaluateWhen, templateString, applyFilter, resolveLoop, templateArgs, handleNotify, normalizeConditions, helper functions). All pass. Commit `6e346cb`.
 - [x] **Expand infra/ tests** — Added `hetzner_test.go` (HCloudClient/HRobotClient construction, do() round-trip via httptest, API error handling, JSON serialisation for HCloudServer, HCloudLoadBalancer, HRobotServer) and `cloudns_test.go` (doRaw() round-trip, zone/record JSON, CRUD responses, ACME challenge, auth params, errors). Commit `6e346cb`.
-- [ ] **Expand build/ tests** — Add: builder detection tests (each builder's `Detect()` with matching/non-matching directory structures), archive round-trip (create tar.gz → extract → compare), signing mock tests (verify `Sign()` called with correct paths).
-- [ ] **Expand release/ tests** — Add: version detection from git tags / package.json / go.mod, changelog generation from conventional commits (mock git log output), publisher dry-run tests. Note: pre-existing nil pointer crash in `TestLinuxKitPublisher_Publish_NilRelCfg_Good` at `linuxkit.go:50`.
+- [x] **Expand build/ tests** — Added `archive_test.go` (archive round-trip for tar.gz/zip, multi-file archives, 249 LOC) and extended `signing_test.go` (mock signer tests, path verification, error handling, +181 LOC). Commit `5d22ed9`.
+- [x] **Expand release/ tests** — Fixed nil pointer crash in `linuxkit.go:50` (added `release.FS == nil` guard). Added nil FS test case to `linuxkit_test.go` (+23 LOC). 862 tests pass across build/ and release/. Commit `5d22ed9`.
 - [x] **Race condition tests** — `go test -race ./...` clean across ansible, infra, container, devops, build packages. Commit `6e346cb`.
 - [x] **`go vet ./...` clean** — Fixed stale API calls in container/linuxkit_test.go, state_test.go, templates_test.go, devops/devops_test.go. go.mod replace directive fixed. Commit `6e346cb`.