v2.0: Modernization (M1-M6, 44 tasks)#374

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etr wants to merge 32 commits intomasterfrom

Commits on May 1, 2026

Fix CI: drop C++20-incompatible compilers and add libmicrohttpd-devel for MSYS

etr
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claude
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Fix MSYS/Cygwin build: expose _DEFAULT_SOURCE for libmicrohttpd's fd_set check

etr
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claude
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Fix CI follow-up: add LGPL header to gate tests, drop ubuntu-toolchain PPA, revert MSYS libmicrohttpd-devel

etr
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claude
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TASK-003: Add httpserver::feature_unavailable exception type
etr
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Merge TASK-003: Add httpserver::feature_unavailable exception type
etr
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TASK-004: Add httpserver::iovec_entry POD with layout-pinning asserts

etr
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claude
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TASK-004: fix use-after-free in copy ctor, header hygiene, test improvements

etr
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claude
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Commits on May 2, 2026

Commits on May 3, 2026