Phase 18 — Audio (music director + SFX catalog + bus wiring)

Adds an AudioManager autoload with three buses (Master, Music routed to
Master, SFX routed to Master), a small catalog of looping music + one-shot
SFX, and a single persistent AudioStreamPlayer for the music director.

Music
* Day and night loops swap on Clock.phase_changed (night during the night
  phase, day everywhere else). Tracks pulled from Retro Farming Music 1
  (day) and Cozy Melodies Pack 1 (night), both loopable OGG.

SFX
* Tree.fell, Rock.mined, BigRock.mined → tree_fell / mine_tick.
* EventBus.pawn_took_damage → combat_hit (Sword Pack 1).
* EventBus.storyteller_event_fired → ui_confirm sting.
* EventBus.alert_added → ui_click.
* play_sfx is rate-limited per key (80ms cooldown) so fast-sim doesn't
  saturate the mixer.

Settings + suspend
* SettingsMenu master/music/sfx sliders now live-bind to the bus dB via
  Audio.set_*_linear (linear → dB internally, 0 → -80dB silence). The
  ambient slider is intentionally unwired; no ambient bus this pass.
* NOTIFICATION_APPLICATION_PAUSED + FOCUS_OUT mute the Master bus to
  match the existing "no background sim" rule. Resume + focus restore it.

Bundle housekeeping
* Two zipped packs in the ElvGames bundle (Cozy Melodies Pack 1, Retro
  Farming Music 1) extracted in place to keep pack identity intact for
  the license/credits string. 8 OGG files curated into audio/ at ~5.3MB.

Verified end-to-end via MCP runtime: buses online, day_loop plays at
boot, manual phase swap day→night→day round-trips, slider linear→dB
mapping correct (0.5 → -6.02dB, 0.0 → -80dB), tree_fell SFX triggers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scenes/entities/big_rock.gd

@@ -147,6 +147,8 @@ func mined() -> void:
 		get_parent().add_child(item)
 		item.setup(Item.TYPE_STONE, 1, ft)
 	Audit.log("big_rock", "mined 2×2 at %s; %d stone drops" % [origin_tile, STONE_DROPS_ON_MINE])
+	if Audio != null:
+		Audio.play_sfx(&"mine_tick")
 	queue_free()
 
 

scenes/entities/rock.gd

@@ -122,6 +122,8 @@ func mined() -> void:
 	get_parent().add_child(item)
 	item.setup(Item.TYPE_STONE, 1, tile)
 	Audit.log("rock", "mined at %s; %d stone drop" % [tile, STONE_DROPS_ON_MINE])
+	if Audio != null:
+		Audio.play_sfx(&"mine_tick")
 	queue_free()
 
 

scenes/entities/tree.gd

@@ -117,6 +117,8 @@ func fell() -> void:
 		item.setup(Item.TYPE_WOOD, STACK_SIZE_PER_DROP, drop_tile)
 		drops_count += 1
 	Audit.log("tree", "felled at %s; %d wood drops" % [tile, drops_count])
+	if Audio != null:
+		Audio.play_sfx(&"tree_fell")
 	queue_free()
 
 

scenes/ui/settings_menu.gd

@@ -206,6 +206,20 @@ func _load_from_game_state() -> void:
 	_sl_sfx.value     = float(s.get("audio_sfx",     1.0))
 	_sl_ambient.value = float(s.get("audio_ambient", 1.0))
 
+	# Push initial slider values into the live audio buses + bind live updates.
+	# Done here rather than _ready because _load_from_game_state fires after
+	# GameState has restored settings from disk.
+	if Audio != null:
+		Audio.set_master_linear(_sl_master.value)
+		Audio.set_music_linear(_sl_music.value)
+		Audio.set_sfx_linear(_sl_sfx.value)
+		if not _sl_master.value_changed.is_connected(Audio.set_master_linear):
+			_sl_master.value_changed.connect(Audio.set_master_linear)
+			_sl_music.value_changed.connect(Audio.set_music_linear)
+			_sl_sfx.value_changed.connect(Audio.set_sfx_linear)
+			# Ambient slider isn't wired to a bus yet (no ambient bus in Phase 18).
+			# Phase 19 onboarding pass may add a third bus for nature SFX.
+
 	_cb_large_text.button_pressed    = bool(s.get("accessibility_large_text",    false))
 	_cb_reduce_motion.button_pressed = bool(s.get("accessibility_reduce_motion", false))