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, 3 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 7cfa4a1..e10a476 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 CC      = gcc
 CFLAGS  = -Wall -Wextra -Wpedantic -std=c11 -D_GNU_SOURCE \
            -O2 -g
-LDFLAGS = -lyaml
+LDFLAGS = -lyaml -lsystemd
 
 DAEMON_SRCS = \
     src/main.c \
@@ -13,7 +13,8 @@ DAEMON_SRCS = \
     src/client.c \
     src/log.c \
     src/log_tail.c \
-    src/console/rcon.c
+    src/console/rcon.c \
+    src/console/a2s.c
 
 CLI_SRCS = clients/umbrella-cli/main.c