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>

audio/music/day_loop.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://gh1dj6e0s30i"
+path="res://.godot/imported/day_loop.ogg-1ef9d593f4880150447e96ed1638de1a.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/music/day_loop.ogg"
+dest_files=["res://.godot/imported/day_loop.ogg-1ef9d593f4880150447e96ed1638de1a.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/music/night_loop.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://hm47ast0d47p"
+path="res://.godot/imported/night_loop.ogg-1fb74a57de28c3ab1846d94968313401.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/music/night_loop.ogg"
+dest_files=["res://.godot/imported/night_loop.ogg-1fb74a57de28c3ab1846d94968313401.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/sfx/chop_tick.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://dk2ss1sdgm8lw"
+path="res://.godot/imported/chop_tick.ogg-1191be103addf15adb12fb1d2ad20399.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/sfx/chop_tick.ogg"
+dest_files=["res://.godot/imported/chop_tick.ogg-1191be103addf15adb12fb1d2ad20399.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/sfx/combat_hit.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://blu62gt88uk35"
+path="res://.godot/imported/combat_hit.ogg-2c581babb041c9b69d6880bc8effd337.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/sfx/combat_hit.ogg"
+dest_files=["res://.godot/imported/combat_hit.ogg-2c581babb041c9b69d6880bc8effd337.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/sfx/mine_tick.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://d06ntx5yx8svj"
+path="res://.godot/imported/mine_tick.ogg-718359cc14cbf53d082e1aa4ad5475b4.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/sfx/mine_tick.ogg"
+dest_files=["res://.godot/imported/mine_tick.ogg-718359cc14cbf53d082e1aa4ad5475b4.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/sfx/tree_fell.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://cqivy0rn03sou"
+path="res://.godot/imported/tree_fell.ogg-4d1a7ace71389c0ff9fe8b0fedd012ba.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/sfx/tree_fell.ogg"
+dest_files=["res://.godot/imported/tree_fell.ogg-4d1a7ace71389c0ff9fe8b0fedd012ba.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/sfx/ui_click.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://dwo0kvjvyio6h"
+path="res://.godot/imported/ui_click.ogg-be6446e005e272718f7786e12bdf1e1e.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/sfx/ui_click.ogg"
+dest_files=["res://.godot/imported/ui_click.ogg-be6446e005e272718f7786e12bdf1e1e.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

audio/sfx/ui_confirm.ogg.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://bfgwe7ycnmuc3"
+path="res://.godot/imported/ui_confirm.ogg-f006b0c94e1ad4799df46c4e5bc06e82.oggvorbisstr"
+
+[deps]
+
+source_file="res://audio/sfx/ui_confirm.ogg"
+dest_files=["res://.godot/imported/ui_confirm.ogg-f006b0c94e1ad4799df46c4e5bc06e82.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4