Add A2S probing, sd-bus state, tail/broadcast, and bot audit logclaude/trusting-dirac

State detection:
- Add STATE_STOPPING to ProcessState enum
- Replace system("systemctl is-active") with libsystemd sd-bus API for
  accurate starting/stopping/crashed state reporting; works for any unit
  type (RCON or STDIN) that declares a service: field
- Implement real A2S_INFO UDP queries (src/console/a2s.c) for units
  with health.type = a2s (Valve games: TF2, GMod); differentiates
  running / hibernating (0 players) / changing_map (A2S down, RCON up)
  / unreachable; includes player count and map name in responses
- Refactor probe_rcon_state() into probe_unit_state() returning a
  ProbeResult struct with state, players, max_players, map fields
- status and list responses now include players/max_players/map fields

New daemon commands:
- tail <unit>: return ring buffer snapshot as a single response
- broadcast <message>: send broadcast_cmd-formatted message to all
  running units; works for both RCON and STDIN console types

New YAML field:
- broadcast_cmd: command template (e.g. "say {msg}") — opt-in per
  unit; units without it are skipped by broadcast

CLI (umbrella-cli):
- Add tail subcommand (non-interactive output snapshot)
- Add broadcast subcommand
- status shows Players and Map when available
- list adds PLAYERS and MAP columns

Bot (umbrella-bot):
- Replace !attach / !detach with !tail (shows last 30 lines, no streaming)
- Add !broadcast command
- Write per-!cmd audit entries to /var/log/umbrella/bot-audit.log
- !units and !status responses include player counts when available

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

1 files changed, 27 insertions, 0 deletions

diff --git a/src/console/a2s.h b/src/console/a2s.h
new file mode 100644
index 0000000..c96e445
--- /dev/null
+++ b/src/console/a2s.h
@@ -0,0 +1,27 @@
+#ifndef A2S_H
+#define A2S_H
+
+#include <stdint.h>
+
+/*
+ * A2S_INFO query (Valve Source engine query protocol).
+ * Retrieves server information over UDP.
+ *
+ * Only used for units with health.type == HEALTH_A2S.
+ */
+
+typedef struct {
+    int  players;       /* current player count */
+    int  max_players;   /* server player limit */
+    char map[64];       /* current map name */
+} A2SInfo;
+
+/*
+ * a2s_query: Send an A2S_INFO request and parse the response.
+ *
+ * Returns 0 on success with *out populated.
+ * Returns -1 on timeout, parse error, or any network failure.
+ */
+int a2s_query(const char *host, uint16_t port, int timeout_ms, A2SInfo *out);
+
+#endif /* A2S_H */