Cleaning up obsolete local product workspaces

The obsolete product locations and temporary directory were removed. parent tracking policy, products/project guide, and workspace settings were aligned with an empty placement area and future independent Git boundaries. Only the editorial skill and operating section unused by the isolated Runner were removed, while managed-agent definitions were preserved.

The old local product container was removed from the parent tracking boundary, leaving only the registry project guide tracked directly under products. Each product directory is treated as an independent Git boundary, and the parent workspace retains no reference to the removed product.

`[agents].max_threads` を想定同時 open thread 数と resource budget に照らして再評価してから TOML parse と diff check を行います。`max_threads` は role ごとの pool ではなく、同じ role の複数 instance を含め、同時に開ける全 custom-agent thread の global cap です。静的 agent 定義数とは独立しており、定義を置くだけでは slot を消費しません。現在値12の運用余力は、`.codex/agents/*.toml`に定義された全roleを各1 instanceずつ同時に開く場合の定義数との差分で判断します。値を増やしても CPU、memory、network、tool quota、working tree の contention は解消しません。domain lead の handoff plan に基づいて Mako が必要な thread だけを起動し、依存関係がある work や同じ file 群に触る write-heavy work は並列化しません。