优化原生结果编码传输与浏览器缓存，记录八路性能基线

原生结果series通过字节索引直传，C端使用Ryu精确回读编码和64 KiB批量写出；网页采用Float64缓存和CSV工作线程，减少结果处理与保存等待。

补充八路AME曲线核查、全流程分阶段计时、独立编码基准和复现工具，固定后续优化采用修正八路及rtol=1e-8。C写出1.1808→0.1638 s，点击到可查看8.0100→6.9756 s。

验证：最终10项编码专项、29项相关后端回归通过；8份原生结果逐位一致，16次网页结果/CSV/刷新恢复通过。前端构建及缓存/CSV专项在本轮结果处理工作中通过。环境、原始大结果与临时构建不纳入Git。

app/simulation/native_codegen/build.py

@@ -52,7 +52,7 @@ def toolchain() -> tuple[str, Path, str]:
 def build_native(program: NativeProgram, *, cache_dir: Path | None = None) -> NativeBuild:
     start = time.perf_counter()
     compiler, sundials, compiler_version = toolchain()
-    runtime = sorted(NATIVE.rglob("*.c")) + sorted((NATIVE / "include").glob("*.h"))
+    runtime = sorted(NATIVE.rglob("*.c")) + sorted((NATIVE / "include").rglob("*.h"))
     flags = ["-std=c11", "-O3", "-Wall", "-Wextra", "-Werror", "-ffp-contract=off", "-fno-fast-math"]
     executable_name = "model.exe" if os.name == "nt" else "model"
     if os.name == "nt":

app/simulation/native_codegen/runner.py

@@ -12,13 +12,14 @@ import time
 
 from app.simulation.config import SolveIVPConfig
 from app.simulation.results import GenericSimulationResult
+from .transport import NativeSeriesJson, read_indexed_result
 from .build import NativeBuild, build_native
 from .compiler import NativeCapabilityError, compile_native_program
 
 
 def execute_native(build: NativeBuild, config: SolveIVPConfig, sample_step: float, *,
                    run_dir: Path, record_samples=True, cancel_check=None,
-                   progress_callback=None, activity_tracker=None, timeout=300.0) -> dict:
+                   progress_callback=None, activity_tracker=None, timeout=300.0, raw_series=False) -> dict:
     if config.method not in ("RK45", "BDF"):
         raise NativeCapabilityError(f"Native v1 does not support method {config.method}.")
     if not isinstance(config.atol, (int, float)) or config.atol != 1e-8 or config.first_step is not None:
@@ -26,13 +27,16 @@ def execute_native(build: NativeBuild, config: SolveIVPConfig, sample_step: floa
     run_dir.mkdir(parents=True, exist_ok=True)
     output = run_dir / "result.json"
     cancel_path = run_dir / "cancel.request"
-    if output.exists() or cancel_path.exists():
+    index_path = run_dir / "result-index.json"
+    if output.exists() or cancel_path.exists() or index_path.exists():
         raise ValueError("Native execution requires a fresh run directory.")
     command = [str(build.executable), "--method", config.method,
                "--start", str(config.t_start), "--stop", str(config.t_stop),
                "--sample-step", str(sample_step), "--max-step", str(config.max_step),
                "--rtol", str(config.rtol), "--timeout", str(timeout),
                "--cancel-file", str(cancel_path.resolve()), "--output", str(output.resolve())]
+    if raw_series:
+        command.extend(["--result-index", str(index_path.resolve())])
     if not record_samples:
         command.append("--solve-only")
     creationflags = subprocess.CREATE_NO_WINDOW if os.name == "nt" else 0
@@ -86,9 +90,13 @@ def execute_native(build: NativeBuild, config: SolveIVPConfig, sample_step: floa
             process.stderr.close()
     if not output.is_file():
         raise RuntimeError(f"Native worker exited with code {process.returncode} without results; see {run_dir / 'worker.log'}.")
-    payload = json.loads(output.read_text(encoding="utf-8"))
     if process.returncode not in (0, 2):
         raise RuntimeError(f"Native worker failed with exit code {process.returncode}.")
+    try:
+        payload = (read_indexed_result(output, index_path) if raw_series
+                   else json.loads(output.read_text(encoding="utf-8")))
+    except OSError as exc:
+        raise RuntimeError(f"Cannot read native worker result artifacts: {exc}") from exc
     payload["processWallSeconds"] = time.perf_counter()-started
     payload["buildKey"] = build.manifest["buildKey"]
     payload["cacheHit"] = build.cache_hit
@@ -99,7 +107,7 @@ def execute_native(build: NativeBuild, config: SolveIVPConfig, sample_step: floa
 
 
 def simulate_native(network, config, *, sample_step, progress_callback=None,
-                    cancel_check=None, activity_tracker=None):
+                    cancel_check=None, activity_tracker=None, raw_series=False):
     if config.method not in ("RK45", "BDF"):
         raise NativeCapabilityError(f"Native v1 does not support method {config.method}.")
     if progress_callback:
@@ -109,7 +117,7 @@ def simulate_native(network, config, *, sample_step, progress_callback=None,
     with tempfile.TemporaryDirectory(prefix="native-simulation-") as directory:
         data = execute_native(build, config, sample_step, run_dir=Path(directory),
                               cancel_check=cancel_check, progress_callback=progress_callback,
-                              activity_tracker=activity_tracker)
+                              activity_tracker=activity_tracker, raw_series=raw_series)
     totals = {
         "nfev": data["nfev"], "njev": data["njev"], "nlu": data["nlu"],
         "acceptedStepCount": data["acceptedSteps"], "rejectedStepCount": data["rejectedSteps"],
@@ -124,5 +132,6 @@ def simulate_native(network, config, *, sample_step, progress_callback=None,
         variables=program.variables, series=data["series"], final=data["final"],
         diagnostics={"backend": "native-c", "native": {k: v for k, v in data.items()
                      if k not in ("series", "final", "finalState")}, "integration": {"method": config.method, "rtol": config.rtol, "totals": totals},
-                     "stateCount": len(program.state_keys), "sampleCount": len(data["series"]["time"])},
+                     "stateCount": len(program.state_keys), "sampleCount": (data["series"].sample_count if isinstance(data["series"], NativeSeriesJson)
+                                     else len(data["series"].get("time", [])))},
     )

app/simulation/native_codegen/transport.py

@@ -0,0 +1,63 @@
+"""Carry trusted C-generated series JSON without a Python float-array round trip.
+
+Only native output plus its byte index may construct this transport object. Public
+JSON still has the ordinary object/array schema; synchronous callers materialize
+it explicitly. Bytes own their lifetime independently of the worker directory.
+"""
+from dataclasses import dataclass
+import json
+from pathlib import Path
+
+
+@dataclass(frozen=True)
+class NativeSeriesJson:
+    data: bytes
+    sample_count: int
+
+    def materialize(self) -> dict[str, list[float]]:
+        return json.loads(self.data)
+
+
+def read_indexed_result(output: Path, index_path: Path) -> dict:
+    index = json.loads(index_path.read_bytes())
+    if not isinstance(index, dict) or type(index.get('version')) is not int or index['version'] != 1:
+        raise ValueError('Unsupported native result index.')
+    names = ('seriesStart', 'seriesEnd', 'resultBytes', 'sampleCount')
+    if any(type(index.get(key)) is not int for key in names):
+        raise ValueError('Invalid native result index integers.')
+    start, end, length, count = (index[key] for key in names)
+    if not (0 < start < end < length and count >= 0):
+        raise ValueError('Invalid native result index bounds.')
+    if output.stat().st_size != length:
+        raise ValueError('Incomplete native result file.')
+    raw = output.read_bytes()
+    if (len(raw) != length or not raw[:start].endswith(b'"series":')
+            or raw[start:start+1] != b'{' or raw[end-1:end] != b'}'
+            or not raw[end:].startswith(b',"final":')):
+        raise ValueError('Native result index does not match the output layout.')
+    # The C writer supplies exact boundaries. No search through strings or numeric
+    # arrays, and no large json.loads call: only diagnostics/final values are read.
+    metadata = json.loads(raw[:start] + b'{}' + raw[end:])
+    if not isinstance(metadata, dict) or metadata.get('series') != {}:
+        raise ValueError('Invalid native result metadata.')
+    metadata['series'] = NativeSeriesJson(raw[start:end], count)
+    return metadata
+
+
+def serialize_result_parts(payload: dict) -> tuple[bytes, ...]:
+    """Return one JSON object in three byte segments, without copying its series.
+
+    The only raw position is payload.result.series, produced by our C writer;
+    all model-provided labels, messages and keys use the standard JSON encoder.
+    """
+    result = payload.get('result')
+    series = result.get('series') if isinstance(result, dict) else None
+    if not isinstance(series, NativeSeriesJson):
+        return (json.dumps(payload, ensure_ascii=False, separators=(',', ':')).encode('utf-8'),)
+    metadata = {key: value for key, value in result.items() if key != 'series'}
+    outer = {key: value for key, value in payload.items() if key != 'result'}
+    encoded = json.dumps(metadata, ensure_ascii=False, separators=(',', ':')).encode('utf-8')
+    remainder = json.dumps(outer, ensure_ascii=False, separators=(',', ':')).encode('utf-8')
+    prefix = b'{"result":' + encoded[:-1] + (b',' if metadata else b'') + b'"series":'
+    suffix = b'}' + (b',' + remainder[1:] if outer else b'}')
+    return prefix, series.data, suffix