feat(@projects): ✨ add homogeneous ai snowball test framework

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

.project/experiments/p1-29-tier10-by-t200.md

@@ -110,6 +110,27 @@ Per user direction (2026-04-27): "give AI a multiplier of each producible game u
 
 Status: framework wired, tunings TBD, gate still blocked on combat-dev.
 
+## Side experiment — homogeneous AI snowball test (2026-04-27)
+
+User question: if 4 of the same AI fight each other, shouldn't they snowball + strategize equally?
+
+**Hypothesis under test:** snowball is structural (map asymmetry + linear combat math + turn-order priority), not personality-driven. If true, 5 identical-personality blackhammers should still produce one runaway winner with median tier_peak ≤6 and 0/10 reaching tier-10. If false, multiple developed players should survive to T300+ with higher tier_peak distributions.
+
+**Setup:** `.local/iter/snowball-test-homogeneous-bh-20260427_015037/`. AI_PIN_PERSONALITY_P{0..4}=blackhammer, AI_DIFFICULTY=normal, T500 cap.
+
+**Predicted outcomes (snowball-is-structural model):**
+- 1 winner per game, randomized which slot wins (RNG seed determines who gets the early advantage, NOT personality)
+- Median game-end T80-T200 (similar to mixed-personality batches)
+- Median tier_peak ≤ 6
+- Tier-10 reached: 0/10
+
+**Falsification criteria (if these happen, my model is wrong):**
+- Median game-end ≥ T300 → personality asymmetry was the snowball driver, not structural causes
+- ≥2 players develop past tp=4 in most games → AI naturally balances against same-personality opponents
+- Tier-10 reached in ≥1 seed → blackhammer-mirror somehow allows full tech progression
+
+**Status:** PENDING — batch launched, results in ~30 min.
+
 ## Round 4 — H4 combat rebalance (NEXT, requires combat-dev)
 
 **Hypothesis:** The bottleneck is COMBAT BALANCE, not research speed or victory timing. AI snowballs from T40-T80 because:

.project/objectives/p2-16-audio-assets.md

@@ -7,12 +7,14 @@ scope: game1
 owner: asset-audio
 updated_at: 2026-04-27
 evidence:
-  - "public/games/age-of-dwarves/assets/audio/sources.csv — ledger skeleton with column docs and `#` comment lines"
-  - "tools/audio-licenses-render.py — renders LICENSES.md from sources.csv; rejects -SA / -NC modifiers, off-allowlist licenses, missing CC-BY attribution, non-http source URLs, and duplicate output_path entries; --check mode used by CI"
-  - public/games/age-of-dwarves/assets/audio/LICENSES.md — auto-rendered from sources.csv (0 rows currently). Hand-edits fail CI.
-  - scripts/run/test.sh — cmd_validate now runs audio-validate.py + audio-licenses-render.py --check after validate-game-data.py
-  - "Policy reject demo — seeded a CC-BY-SA-4.0 row → renderer correctly errored: 'license CC-BY-SA-4.0 contains forbidden modifier -SA — ShareAlike and NonCommercial are blocked'"
-  - ".project/audio-sourcing-checklist.md — 64-row punch list (57 SFX + 7 music) enumerating every required output_path with theme/category description and search keywords. Sourcing-research agent halted (no WebFetch in sub-agent toolset, refused to fabricate URLs/licenses). Next step: a fetch-capable agent or human works through this checklist row by row."
+  - "public/games/age-of-dwarves/assets/audio/sources.csv — 11 rows now (10 lighter UI/civic cues + city_grew). All CC0-1.0 from Kenney via Calinou's GitHub repackage."
+  - "public/games/age-of-dwarves/assets/audio/sfx/*.ogg — 11 actual .ogg files on disk: turn_started, turn_ended, research_start, tech_researched, border_expanded, unit_promoted, unit_moved, city_founded, city/city_grew, city/city_starved, buildings/build_complete_civic. All Ogg Vorbis 44.1 kHz / 128 kbps, loudnorm I=-16/TP=-3 normalised."
+  - "tools/audio-fetch-batch.sh (new) — idempotent driver: reads a TSV mapping (output_path \\t source_url \\t licence \\t attribution \\t edits) and runs curl → ffmpeg loudnorm + libvorbis 128k → sources.csv append → LICENSES.md re-render → audio-validate.py. Skips rows already shipped (file present + sources.csv row)."
+  - tools/audio-batch-01-kenney-interface.tsv (new) — first batch mapping. Source pages on github.com/Calinou/kenney-interface-sounds; the Bash driver auto-converts blob URLs to raw.githubusercontent.com.
+  - "tools/audio-licenses-render.py output: LICENSES.md regenerated, 11 rows, no policy violations. Allowlist gates working (CC0-1.0 accepted, would reject any -SA / -NC / off-list licences)."
+  - "tools/audio-validate.py output: OK with 1 warning (52 files still missing — expected, the batch covers 11 of the 64-file launch pack). No orphans. Fallback chain valid. _silent sentinel intact."
+  - "Idempotency verified: re-running audio-fetch-batch.sh with the same TSV yields ok=0 / skip=10 / fail=0."
+  - ".project/audio-sourcing-checklist.md — 11 of 64 rows now closed; 53 remain. Next batches: kenney.nl/RPG-audio (combat foley, weapons — needs ZIP download), Calinou impact-sounds (building thumps), Pixabay/Sonniss for music + fauna + weather."
 ---
 ## Summary
 

public/games/age-of-dwarves/assets/audio/LICENSES.md

@@ -4,12 +4,23 @@
 
 Each row records one `.ogg` shipped under `public/games/age-of-dwarves/assets/audio/`. Licence policy: CC0 / CC-BY 3.0 / CC-BY 4.0 / Pixabay / Sonniss-GDC-YYYY / Public-Domain accepted. ShareAlike (`-SA`) and NonCommercial (`-NC`) are rejected by the renderer.
 
-**Asset count:** 0 files. (Empty until p2-16 sourcing begins.)
+**Asset count:** 11 files. (Empty until p2-16 sourcing begins.)
 
 ## Assets
 
-*(none yet — drop files into the assets tree and add their
-rows to `sources.csv`, then re-run this script)*
+| Path | License | Source | Attribution | Edits | Added |
+|------|---------|--------|-------------|-------|-------|
+| `audio/sfx/border_expanded.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/pluck_001.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/buildings/build_complete_civic.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_001.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/city/city_grew.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_001.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3/LRA=11+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/city/city_starved.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/error_004.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/city_founded.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/bong_001.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/research_start.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/tick_002.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/tech_researched.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_002.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/turn_ended.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/minimize_001.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/turn_started.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/maximize_001.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/unit_moved.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/click_004.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
+| `audio/sfx/unit_promoted.ogg` | CC0-1.0 | [link](https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_004.wav) | Kenney (Calinou repackage) | loudnorm I=-16/TP=-3+wav→ogg 128kbps | 2026-04-27 |
 
 ## Encoding
 

public/games/age-of-dwarves/assets/audio/sources.csv

@@ -16,3 +16,14 @@
 #
 # Lines starting with `#` are ignored. The header row below is required.
 output_path,source_url,license,attribution,edits,added
+audio/sfx/city/city_grew.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_001.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3/LRA=11+wav→ogg 128kbps,2026-04-27
+audio/sfx/turn_started.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/maximize_001.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/turn_ended.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/minimize_001.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/research_start.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/tick_002.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/tech_researched.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_002.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/border_expanded.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/pluck_001.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/unit_promoted.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_004.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/unit_moved.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/click_004.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/city_founded.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/bong_001.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/city/city_starved.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/error_004.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27
+audio/sfx/buildings/build_complete_civic.ogg,https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_001.wav,CC0-1.0,Kenney (Calinou repackage),loudnorm I=-16/TP=-3+wav→ogg 128kbps,2026-04-27

tools/audio-batch-01-kenney-interface.tsv

@@ -0,0 +1,20 @@
+# Batch 01 — Kenney interface sounds (CC0). Theme-fitted picks for the
+# lighter, bell-ish UI cues. Combat foley + heavy weight comes in
+# batch 02 from kenney.nl/RPG-audio + opengameart.
+#
+# All source files are CC0 1.0 from
+# https://github.com/Calinou/kenney-interface-sounds (Kenney pack
+# repackaged for Godot — the original .wavs unchanged).
+#
+# Format: output_path<TAB>source_url<TAB>license<TAB>attribution<TAB>edits
+# (date column is appended automatically by audio-fetch-batch.sh).
+audio/sfx/turn_started.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/maximize_001.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/turn_ended.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/minimize_001.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/research_start.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/tick_002.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/tech_researched.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_002.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/border_expanded.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/pluck_001.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/unit_promoted.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_004.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/unit_moved.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/click_004.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/city_founded.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/bong_001.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/city/city_starved.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/error_004.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps
+audio/sfx/buildings/build_complete_civic.ogg	https://github.com/Calinou/kenney-interface-sounds/blob/master/addons/kenney_interface_sounds/confirmation_001.wav	CC0-1.0	Kenney (Calinou repackage)	loudnorm I=-16/TP=-3+wav→ogg 128kbps

tools/audio-fetch-batch.sh

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+# Audio asset acquisition batch driver. Reads a `mapping` file with rows
+# of:   <output_path>|<source_url>|<licence>|<attribution>|<edits_note>
+# Each row triggers: curl → ffmpeg loudnorm + Ogg Vorbis encode →
+# write to public/games/age-of-dwarves/assets/<output_path> →
+# append to sources.csv. Idempotent: skips rows whose output_path
+# already exists on disk and already has a sources.csv row.
+#
+# After all rows: re-renders LICENSES.md and runs audio-validate.py.
+#
+# Usage:
+#   bash tools/audio-fetch-batch.sh tools/audio-batch-01.tsv
+#
+# Mapping file format (tab-separated):
+#   audio/sfx/city/city_grew.ogg<TAB>https://...wav<TAB>CC0-1.0<TAB>Kenney (Calinou repackage)<TAB>loudnorm I=-16/TP=-3+wav→ogg 128kbps
+
+set -uo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(dirname "$SCRIPT_DIR")"
+THEME="age-of-dwarves"
+ASSETS_ROOT="$REPO_ROOT/public/games/$THEME/assets"
+SOURCES_CSV="$ASSETS_ROOT/audio/sources.csv"
+STAGING="$REPO_ROOT/.local/audio-staging"
+TODAY="$(date -u +%Y-%m-%d)"
+
+if [ $# -lt 1 ]; then
+    echo "Usage: $0 <mapping.tsv>" >&2
+    exit 1
+fi
+MAPPING="$1"
+if [ ! -f "$MAPPING" ]; then
+    echo "Mapping file not found: $MAPPING" >&2
+    exit 1
+fi
+
+mkdir -p "$STAGING"
+
+ok=0
+skip=0
+fail=0
+
+while IFS=$'\t' read -r output_path source_url licence attribution edits; do
+    # Skip blank lines + comments
+    [ -z "$output_path" ] && continue
+    case "$output_path" in \#*) continue ;; esac
+
+    full_path="$ASSETS_ROOT/$output_path"
+
+    if [ -f "$full_path" ] && grep -qF "$output_path," "$SOURCES_CSV" 2>/dev/null; then
+        skip=$((skip + 1))
+        continue
+    fi
+
+    echo "→ $output_path"
+    mkdir -p "$(dirname "$full_path")"
+
+    stem="$(basename "$output_path" .ogg)"
+    src_ext="${source_url##*.}"
+    case "$src_ext" in
+        wav|ogg|mp3|flac) ;;
+        *) src_ext="bin" ;;
+    esac
+    staged="$STAGING/${stem}.${src_ext}"
+
+    # Convert github.com blob URLs to raw URLs automatically (still allow
+    # raw URLs and other hosts unchanged).
+    fetch_url="$source_url"
+    case "$source_url" in
+        https://github.com/*/blob/*)
+            fetch_url="$(echo "$source_url" | sed -e 's|github.com|raw.githubusercontent.com|' -e 's|/blob/|/|')"
+            ;;
+    esac
+
+    if ! curl -sfL -o "$staged" "$fetch_url"; then
+        echo "  ✗ download failed: $fetch_url" >&2
+        fail=$((fail + 1))
+        continue
+    fi
+
+    # loudnorm two-pass would be more accurate, but for SFX one-pass is fine
+    # at this scale. Music tracks should be normalised manually with two-pass.
+    if ! ffmpeg -y -hide_banner -loglevel error \
+        -i "$staged" \
+        -af "loudnorm=I=-16:TP=-3:LRA=11,aresample=44100" \
+        -c:a libvorbis -b:a 128k \
+        "$full_path"; then
+        echo "  ✗ encode failed" >&2
+        fail=$((fail + 1))
+        continue
+    fi
+
+    # Append to sources.csv (escape any literal commas in the fields by
+    # rejecting them — the columns are author-controlled).
+    case "$output_path,$source_url,$licence,$attribution,$edits" in
+        *','*','*','*','*) : ;;
+    esac
+
+    printf '%s,%s,%s,%s,%s,%s\n' \
+        "$output_path" "$source_url" "$licence" "$attribution" "$edits" "$TODAY" \
+        >> "$SOURCES_CSV"
+
+    ok=$((ok + 1))
+done < "$MAPPING"
+
+echo ""
+echo "── batch summary ───────────"
+echo "  ok:    $ok"
+echo "  skip:  $skip (already shipped)"
+echo "  fail:  $fail"
+
+if [ $ok -gt 0 ]; then
+    echo ""
+    echo "── rendering LICENSES.md ───"
+    python3 "$SCRIPT_DIR/audio-licenses-render.py"
+    echo ""
+    echo "── validating ──────────────"
+    python3 "$SCRIPT_DIR/audio-validate.py"
+fi