{
  "date": "2026-09-22",
  "kind": "Exploratory Web port, architecture review and native performance measurements",
  "status": "Partial browser proof; full browser provider packaging and deployment remain unfinished.",
  "scope": {
    "repositories": [
      "https://github.com/tetrodotoxin-dev/Tetrodotoxin",
      "https://github.com/tetrodotoxin-dev/Godot"
    ],
    "ttx_base_revision": "046c4a3d450a5b7c59f7e9e90166db0dc3c25e59",
    "godot_base_revision": "f0d7e1817ebefb6f46b9c17b3aef34765dca385e",
    "working_state": "Measurements include working-tree changes under review; the base revisions alone do not reproduce the tested sources.",
    "agent_context": "The Web work used the ongoing conversation and human design review. It is not a fresh-context control or a comparison of models.",
    "separate_migration_exercise": "/experiments/convolution-contract.json"
  },
  "file_availability": {
    "initial_change": "The build excluded the native File implementation for Wasm.",
    "correction": "Keep the complete System source inventory. File returns its existing empty Option or False results where it cannot provide native filesystem guarantees.",
    "verification": "Native File tests: 42/42. Native consumer and actual Wasm consumer pass. The latter creates real files through the host C runtime, then confirms File declines operations without changing those files.",
    "limit": "A Root cannot be acquired on the unavailable path, so its member operations cannot be reached through a valid runtime Root there."
  },
  "import_alias": {
    "reproduction": "A new configured alias for the existing CPU module worked through TtxSampler and passed the image inspector, but TtxImage attempted a synthesized lib<alias>_provider.so filename and failed.",
    "correction": "Image acquisition uses the existing import service and retains the acquired module with its image provider.",
    "verification": "Configured alias succeeds; missing aliases and failed loads report failure. A derived image remains readable after removing the alias configuration and releasing its source Resource.",
    "test_source": "https://github.com/tetrodotoxin-dev/Godot/blob/main/tests/scene/check.gd"
  },
  "abi_wrapper_cleanup": {
    "description": "Removed the separate Data Abi wrapper and passed pointer width through the existing Schema, Compiler and Representation owners. Calling convention remains per callable.",
    "production_lines": {
      "before": 2736,
      "after": 2656,
      "difference": -80,
      "measurement": "Physical lines including comments and whitespace in the affected production files. Test lines and unrelated repository files are excluded."
    },
    "compiler_object_text_bytes": {
      "candidate": 46401,
      "rejected_whole_class_specialization": 87060,
      "final_shared_compiler": 46010
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    "object_measurement": "clang++ -std=c++2c -O3 -march=native -DPERI_LINUX -DPERI_RELEASE -fno-exceptions -I<snapshot> -c ttx/data/form/compiler.cpp; size object",
    "decision": "Rejected whole-compiler specialization because it increased compiled size with little performance benefit. Compiled<schema, width> instead passes a constant width through the shared constexpr compiler."
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  "native_performance": {
    "method": "Nine rotated groups of pre-pointer baseline, approved scratch candidate, and final binaries. Same O3 native Clang flags, ThinLTO consumer, separate non-LTO provider, fixed frozen Perimortem headers/runtime archives, CPU affinity and checked outputs from the existing probe.",
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      "before": "Pre-pointer-extension baseline",
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      "width": "Shared pointer-width implementation after wrapper removal"
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            42.228483,
            41.927867,
            42.686737,
            43.067925,
            43.24728,
            42.131078
          ]
        }
      }
    ],
    "validation": "Canonical bytes, metadata, walk checksums, selections, copy outputs and retained calls agree.",
    "interpretation": "No broad hot-path recovery. Final bind and wide lookup remain near the scratch candidate. Heterogeneous Fragment copying remains about 11 to 14 percent above the original baseline. The 1024-value Fragment copy is 11.5 percent slower than the scratch candidate, though faster than the original baseline. This is not performance clearance.",
    "limits": [
      "Native microbenchmarks, not browser or full-application timings.",
      "The shared implementation is simpler but is not a performance clearance.",
      "Repeated timing samples do not constitute repeated independent agent implementations."
    ]
  },
  "godot_engine": {
    "version": "4.7.2",
    "compiler": "Emscripten 4.0.20",
    "stock": {
      "bytes": 44078870,
      "mib": 42.03688621520996,
      "sha256": "e0c3b75ff009c54b83a02ae819e04dd1f533f457c54e516f440a564d8f308a07",
      "gzip_9_bytes": 10474784,
      "brotli_6_bytes": 8358487
    },
    "reduced": {
      "bytes": 25617433,
      "mib": 24.43068790435791,
      "sha256": "85e987dd3aa775c164ebf570affd4324f69d5f1c1c5bdfb1bd7e0c69c5d14d50",
      "gzip_9_bytes": 5875321,
      "brotli_6_bytes": 4589050
    },
    "uncompressed_reduction_percent": 41.88273655835552,
    "retained": [
      "2D and full GUI controls",
      "GDScript",
      "FreeType",
      "SVG",
      "TextServerFallback",
      "WebGL renderer",
      "GDExtension support"
    ],
    "removed": [
      "3D nodes",
      "2D and 3D physics",
      "XR",
      "Optional modules except the four explicitly enabled"
    ],
    "profile_source": "https://github.com/tetrodotoxin-dev/Godot/blob/main/gdextension/build/web_engine.py",
    "build_options": [
      "platform=web",
      "target=template_release",
      "threads=no",
      "dlink_enabled=yes",
      "lto=full",
      "optimize=size",
      "debug_symbols=no",
      "lab engine feature profile"
    ],
    "limits": [
      "Engine feature and configuration comparison, not a TTX representation-size improvement.",
      "No per-feature ablation establishes the individual savings from XR, 3D, text shaping or other modules.",
      "Compressed sizes are measured files, not browser memory consumption or verified production network transfer sizes.",
      "Fallback text rendering does not retain advanced text shaping."
    ]
  },
  "browser_proofs": {
    "environment": "Playwright Chromium 153, WebGL via SwiftShader, isolated project",
    "engine_probe": {
      "missing": [],
      "packing": true,
      "passed": true,
      "png": true,
      "rendering": true,
      "unexpected": []
    },
    "gdscript_ttx_roundtrip": {
      "created": true,
      "inverted": true,
      "passed": true,
      "retained": true
    },
    "roundtrip": "GDScript creates an image through the current Wasm TTX bridge, requests inversion, checks the expected pixels, and reads a retained snapshot after releasing the original image, transformed image and provider references.",
    "saved_lab": "The stock engine crashes; the reduced engine displays the same saved application pack and extension, but providers remain unavailable. The engine/runtime difference has not been isolated to one cause.",
    "not_proven": [
      "Complete usable browser lab",
      "CPU/FFTW provider in Wasm",
      "Website deployment",
      "A general performance or productivity advantage"
    ]
  },
  "human_review": [
    "Required failure to remain in the File API instead of excluding its implementation from the build.",
    "Requested correction of image acquisition to use the existing configured imports.",
    "Questioned the separate ABI wrapper and requested measurements instead of inferring performance from source structure.",
    "Selected a smaller Godot host feature surface."
  ],
  "limitations": [
    "These are observations from one ongoing engineering effort, not a controlled architecture or agent-productivity study.",
    "Local source snapshots and complete logs are retained for review; this public record provides measurements and selected method details, not a complete reproducible build archive.",
    "The callable-signature migration had a narrower task and different context, so its outcome cannot be directly ranked against the Web port."
  ]
}