left4me: scaffold bundle (items/metadata/README stubs)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bundles/left4me/README.md

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+# left4me
+
+L4D2 game-server management platform. See Task B12 for the full README.

bundles/left4me/items.py

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+# Items for the left4me bundle. Filled in across Tasks B3-B5.
+# Systemd units come from metadata via bundles/systemd/ — there are no
+# .service or .slice files in this bundle's files/ tree.
+
+directories = {}
+files = {}
+actions = {}
+git_deploy = {}
+pkg_apt = {}
+svc_systemd = {}

bundles/left4me/metadata.py

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+defaults = {
+    'left4me': {
+        'gunicorn_workers': 1,
+        'gunicorn_threads': 32,
+        'job_worker_threads': 4,
+        'port_range_start': 27015,
+        'port_range_end': 27115,
+    },
+    'apt': {
+        'packages': {
+            'p7zip-full': {},
+            'nftables': {},
+            'iproute2': {},
+            'curl': {},
+            'ca-certificates': {},
+        },
+    },
+}