chore(cli): remove dead decnet correlate command

The CLI was a day-one debug helper that read a log file or stdin and
printed a traversal table. It hadn't been wired to the live data path
since the engine moved into the profiler worker (DEBT.md:218). No
deploy unit, no caller, no doc relied on it. Removed the command and
its two tests; `decnet/correlation/` stays as a library consumed by
the profiler and the reuse correlator.

tests/cli/test_cli.py

@@ -324,26 +324,6 @@ class TestWebCommand:
         assert "Serving DECNET Web Dashboard" in result.stdout
 
 
-# ── correlate command ─────────────────────────────────────────────────────────
-
-class TestCorrelateCommand:
-    def test_correlate_no_input(self):
-        with patch("sys.stdin.isatty", return_value=True):
-            result = runner.invoke(app, ["correlate"])
-            if result.exit_code != 0:
-                assert result.exit_code == 1
-                assert "Provide --log-file" in result.stdout
-
-    def test_correlate_with_file(self, tmp_path):
-        log_file = tmp_path / "test.log"
-        log_file.write_text(
-            "<134>1 2024-01-15T12:00:00+00:00 decky-01 ssh - auth "
-            '[relay@55555 src_ip="10.0.0.5" username="admin"] login\n'
-        )
-        result = runner.invoke(app, ["correlate", "--log-file", str(log_file)])
-        assert result.exit_code == 0
-
-
 # ── api command ───────────────────────────────────────────────────────────────
 
 class TestApiCommand: