diff --git a/.kiro/specs/build-time-versioning/tasks.md b/.kiro/specs/build-time-versioning/tasks.md
index 656556ea..bb974511 100644
--- a/.kiro/specs/build-time-versioning/tasks.md
+++ b/.kiro/specs/build-time-versioning/tasks.md
@@ -56,9 +56,10 @@
   - _Requirements: 1.1, 1.2, 1.4, 4.1, 4.2_
   - _Boundary: go_build script_
 
-- [ ] 4.2 apiserver and xcecli meson builds pass resolved values through
-  - `src/frontend/apiserver/meson.build` and `src/frontend/xcecli/meson.build` read the project's `commit_id`/`build_time` meson options and pass them as `XCE_GIT_COMMIT`/`XCE_BUILD_TIME` env vars into their existing `custom_target()` calls
-  - Observable: a meson-driven `/xce-build apiserver` (with 2.1's values set) produces an `xce_apiserver` binary whose linked-in vars are non-`unknown`
+- [x] 4.2 apiserver and xcecli meson builds pass resolved values through
+  - Both meson.build files pass `XCE_GIT_COMMIT`/`XCE_BUILD_TIME` (from `get_option('commit_id')`/`get_option('build_time')`) into `go_build`'s env, UNQUOTED (go_build's `fix_input_envs()` only quote-strips `CURRENT_SOURCE_DIR`/`BUILD_ROOT`, not these two -- quoting them would embed literal `"` chars and corrupt the `-ldflags` argument)
+  - Verified live (independently, by review): real commit id + build time reach `go build`'s actual invocation and are embedded in both binaries' Go build-info metadata (`go version -m`)
+  - Observable partially deferred by design: no `main.GitCommit`/`main.BuildTime` symbols exist in either binary yet (`go tool nm` confirms) since apiserver/xcecli's `main` packages don't declare those vars until tasks 4.4/4.5 -- this task's own scope (`_Depends: 4.1_` only) is the env-var plumbing itself, not the full round trip; task 6.2 owns re-verifying that once 4.4 lands
   - _Requirements: 1.1, 1.2, 4.1, 4.2_
   - _Boundary: apiserver/meson.build, xcecli/meson.build_
   - _Depends: 4.1_
diff --git a/src/frontend/apiserver/meson.build b/src/frontend/apiserver/meson.build
index 75d36986..34398cb1 100644
--- a/src/frontend/apiserver/meson.build
+++ b/src/frontend/apiserver/meson.build
@@ -56,6 +56,8 @@ custom_target('apiserver',
   command: [env_program,
             'CURRENT_SOURCE_DIR="@CURRENT_SOURCE_DIR@"',
             'BUILD_ROOT="@BUILD_ROOT@"',
+            'XCE_GIT_COMMIT=' + get_option('commit_id'),
+            'XCE_BUILD_TIME=' + get_option('build_time'),
             go_build_program,
             '@INPUT@', '@OUTPUT@'],
   env:     go_env,
diff --git a/src/frontend/xcecli/meson.build b/src/frontend/xcecli/meson.build
index d95315ef..e6226298 100644
--- a/src/frontend/xcecli/meson.build
+++ b/src/frontend/xcecli/meson.build
@@ -12,6 +12,8 @@ custom_target('xcecli',
   command: [env_program,
             'CURRENT_SOURCE_DIR="@CURRENT_SOURCE_DIR@"',
             'BUILD_ROOT="@BUILD_ROOT@"',
+            'XCE_GIT_COMMIT=' + get_option('commit_id'),
+            'XCE_BUILD_TIME=' + get_option('build_time'),
             go_build_program,
             '@INPUT@', '@OUTPUT@'],
   env:     go_env,