Unplug the bwrap namespace-support probe from -t/--test

detect_bwrap_unshare_args()'s output was diagnostic/capability info,
not an actual test; run_self_tests() reverts to an empty placeholder
for real tests to land in later.

CLAUDE.md

@@ -147,9 +147,10 @@ Source layout (all under `src/`):
 - `self_test.{h,cpp}` — `run_self_tests()` implements `-t/--test`, this
   project's own built-in self-test mode (distinct from the Meson-driven
   fixture smoke test under `tests/`, described in "Build & test commands"
-  below). Currently just reports `detect_bwrap_unshare_args()`'s output
-  (`bwrap.{h,cpp}`); deliberately its own small file since real tests are
-  expected here soon.
+  below). Currently an empty placeholder (previously reported
+  `detect_bwrap_unshare_args()`'s output — `bwrap.{h,cpp}` — unplugged since
+  that's kernel-capability diagnostics, not a test); deliberately its own
+  small file since real tests are expected here soon.
 - `env_spec.{h,cpp}` — `resolve_env_specs()` turns an ordered list of
   `EnvSpec {is_file, value}` (see `cli_args.{h,cpp}` above) into a flat, ordered list of
   `(key, value)` pairs. A literal (`--env`) is split at its *first* `=` (the
@@ -217,8 +218,8 @@ Source layout (all under `src/`):
   access at all, until `slirp4netns` integration (the next task on this same
   branch) actually sets one up; `global.unshare-net: off` restores the prior
   no-isolation behavior in the meantime. `detect_bwrap_unshare_args()` itself is
-  untouched by any of this — still an unfiltered kernel-capability probe, so
-  `-t/--test`'s diagnostic report continues to reflect raw kernel support, not policy.
+  untouched by any of this — still an unfiltered kernel-capability probe, unrelated
+  to policy (no longer surfaced via `-t/--test`, see `self_test.{h,cpp}` below).
   `build_bwrap_args()`/`run_bwrap()` also take an optional `hostname` (from
   `--hostname`, long-option only): passed through as bwrap's own `--hostname` only
   when `--unshare-uts` is actually among the flags `bwrap` is being given (bwrap

src/self_test.cpp

@@ -16,13 +16,6 @@
 
 #include "self_test.h"
 
-#include <fmt/core.h>
-
-#include "bwrap.h"
-
 int run_self_tests() {
-    for (const auto& arg : detect_bwrap_unshare_args()) {
-        fmt::print("{}\n", arg);
-    }
     return 0;
 }

src/self_test.h

@@ -17,7 +17,6 @@
 #pragma once
 
 // Implements -t/--test, this project's own built-in self-test mode (distinct
-// from the Meson-driven fixture smoke test under tests/). Currently just
-// reports which bwrap --unshare-xxx flags the running kernel supports (see
-// detect_bwrap_unshare_args(), bwrap.h) -- a placeholder for real tests.
+// from the Meson-driven fixture smoke test under tests/). Currently an empty
+// placeholder -- real tests are expected here soon.
 int run_self_tests();