feat!(config): global concurrency setting - #44
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New top-level `concurrency` key (default: CPU count - 1) sizes every parallel pool: Markdown page rendering, page building, TikZ compilation, social card generation and privacy downloads. The plugin-level `concurrency` options of social and privacy are removed (breaking; plugin-level usage now warns and is ignored). PDF export tabs now come from --jobs, else global concurrency, and are capped by remaining memory (~200 MiB per Chromium tab) so parallel rendering can't OOM the build. Docs (en+zh) and changelog (en+zh) updated.
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What
concurrencykey (default: CPU count − 1, same schema as the old plugin options) — routes all ThreadPoolExecutor pools through it:build.py×2 (Markdown render, page build) — wasmin(32, cpu)tikz.py(diagram compile) — wasmin(4, n)social.pycard + card-layer pools — now sized inon_config(global config is not available inon_startup)privacy.pydownload poolsocial/privacyplugin-levelconcurrencyoptions removed → plugin-level usage now warns (unknown key) and is ignored; set top-levelconcurrency:.--jobs, else globalconcurrency; capped by available memory (~200 MiB/tab via/proc/meminfoorSC_AVPHYS_PAGES)._tabs_from_memoryunit tests).