loaderDWG: синхронизировать runtime LibreDWG для проверки handle wrap

[konard]

Summary

Fixes #1221.

• Added a loaderDWG. Поиск причины ошибки #1221 section to cad_source/zengine/fileformats/DWG_HANDLE_LOAD_ANALYSIS.md with the new evidence from zcad.log and side files.
• Identified the strongest current hypothesis: ZCAD runtime used an older x86_64-win64 libredwg-0.dll while fpdwginspect used a newer DLL that reads the same DWG correctly.
• Synced environment/runtimefiles/x86_64-win64/common/bin/libredwg-0.dll to the fpdwginspect LibreDWG binary.

Reproduction / Verification Plan

1. Build or refresh the ZCAD runtime so environment/runtimefiles/x86_64-win64/common/bin/libredwg-0.dll is copied into cad/bin.
2. Load the problematic DWG with ZCAD_DWG_DIAG=trace and ZCAD_DWG_TARGET_HANDLES=A325E.
3. Confirm the raw trace no longer wraps FFFF -> 0 -> 1, and that .dwg.handles.csv contains handles above FFFF.
4. Confirm duplicate-handle warnings for the post-FFFF sequence disappear.

Local Checks

• git diff --check
• make checkvars completed, but this container prints missing tag/Lazarus config noise.
• Pascal tests were not run locally because this workspace does not provide fpc or lazbuild.

[konard]

Working session summary

Implemented and pushed the update to PR 1222: #1222

Changed:

• Added the loaderDWG. Поиск причины ошибки #1221 investigation/verification plan to DWG_HANDLE_LOAD_ANALYSIS.md.
• Synced libredwg-0.dll with the newer fpdwginspect DLL. The runtime DLL now matches hash 20cf92d51abc8c27f1af623f68aa4f4d90cf4993737ceac4bc482b237f1f781b.

Verification:

• git diff --check passed.
• make checkvars completed, with existing container noise about missing tag/Lazarus config.
• Pascal tests were not run because this workspace has no fpc or lazbuild.
• No GitHub Actions runs/checks are currently reported for this branch.

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This summary was automatically extracted from the AI working session output.

[konard]

🤖 Solution Draft Log

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💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $8.200771

📊 Context and tokens usage:

• 174.5K / 1.1M (17%) input tokens, 24.5K / 128K (19%) output tokens

Total: (174.5K + 5.4M cached) input tokens, 24.5K output tokens, $8.200771 cost

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.5
• Model: GPT-5.5 (gpt-5.5)

📎 Log file uploaded as Gist (22596KB)

• View complete solution draft log

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[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• CI workflows exist but were not triggered for this commit
• No merge conflicts
• No pending changes

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