Give the shared-JSON profiler its own name

Every PR of the startup batch adds a different tools/profile_client_startup.py,
so any two of them conflict. This one becomes tools/profile_shared_json.py; its
guide and tools/profile_gameplay_decode.py follow.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

tools/PROFILE_SHARED_JSON.md

@@ -38,7 +38,7 @@ done
 cargo build --offline --release -p horizon-client --example shared_json_startup_profile
 cp "$CARGO_TARGET_DIR/release/examples/shared_json_startup_profile" "$BENCH_ROOT/bin/current"
 
-python3 tools/profile_client_startup.py \
+python3 tools/profile_shared_json.py \
   --resources /absolute/path/to/.local/horizon-client/26.3 \
   --baseline-binary "$BENCH_ROOT/bin/baseline" \
   --a01-binary "$BENCH_ROOT/bin/a01" \
@@ -66,7 +66,7 @@ python3 tools/profile_gameplay_decode.py \
   --resources /absolute/path/to/.local/horizon-client/26.3 \
   --repeats 10 --output "$BENCH_ROOT/decode.json"
 
-python3 tools/profile_client_startup.py \
+python3 tools/profile_shared_json.py \
   --resources /absolute/path/to/.local/horizon-client/26.3 \
   --variant released="$BENCH_ROOT/bin/current"@deferred \
   --variant retained="$BENCH_ROOT/bin/current"@deferred-held \

tools/profile_gameplay_decode.py

@@ -11,7 +11,7 @@ import json
 import os
 import statistics
 from pathlib import Path
-from profile_client_startup import percentile, run
+from profile_shared_json import percentile, run
 
 
 def main():