[ondrejmirtes]

Adds PHP 8.2 to the Turbo extension's supported versions without changing the shared-core split. The shared core is still compiled once against PHP 8.5 headers; on 8.2 it loads next to a thin 8.2 extension (main.cpp, Abi.cpp, Shadow.cpp, TrustedTypes.cpp). The shared-core gate reports identical shared code for 8.2, 8.3, 8.4 and 8.6 against the 8.5 reference.

What 8.2 lacks or spells differently

Each difference is either routed through pt_abi or pinned in abi.h:

Difference	Handling
No engine C stack limit (EG(stack_base/limit), zend_call_stack.h are new in 8.3)	On 8.2, Abi.cpp computes the stack bounds the way 8.3 does (Linux, macOS, Windows) and keeps them correct across fresh-stack coroutines; the shared code reads them through pt_abi.eg_stack_*
zend_fcall_info_cache.closure (8.3 grew the struct from 32 to 40 bytes)	Against 8.2 headers, the shared sources see 8.3's layout declared on top of 8.2's struct. The engine only uses the first four fields, and the shared code never reads closure
_ZEND_TYPE_LITERAL_NAME_BIT in internal arginfo	Pinned; on 8.2, Abi.cpp converts it to the plain name bit at registration
zend_zval_value_name() is not exported in 8.2	Routed to zend_zval_type_name(), so native TypeErrors use 8.2's wording ("bool given" rather than "true given")
8.2.35's fallible zend_string_* helpers, smart_str_extract, ZEND_HASH_FILL_* bookkeeping, ZEND_ASSUME	Codegen pins to 8.5's definitions
Z_EXPECTED_NUMBER_OR_STRING, non-const zend_parse_arg_*_slow, bool-returning zend_fiber_init_context	#ifs in the version-specific Abi.cpp

CI and packaging

• 8.2 is added to every turbo matrix in phar.yml, plus the shared-core gate (8.2 and 8.2-zts) and the turbo-build-image.yml tags. Windows builds 8.2 with VS16, like 8.3.
• Alpine 3.24 doesn't package PHP 8.2, so install-alpine-php.sh builds it from the tarball.
• The Windows "below the minimum" control job moves from 8.2 to 8.1.
• TurboExtensionSelector::MINIMUM_PHP_VERSION_ID is now 80200; turbo-ext/composer.json and the README are updated.
• Test harness: on PHP before 8.3, type-family.php reads its 8.3-only fixtures through static analysis. walk-trace.php skips the endless-recursion fixture there, because 8.2 has no stack limit and plain PHP segfaults on it; with turbo, the native side throws the "Maximum call stack size" error.

Verified locally (Linux arm64 in Docker, plus macOS)

• Shared-core gate (clang): 8.2, 8.3, 8.4 and 8.6 identical to the 8.5 reference.
• Strict GCC split build (8.5 core + 8.2 extension): 0 warnings. make lint-turbo is clean.
• On 8.2: smoke, arena, signature parity, trusted types, parser corpus and exit-immediately all pass; walk-trace is identical (675,770 lines).
• Full test suite with turbo: 22,409 tests and 0 failures on 8.2; 0 failures on 8.5.
• PHPStan self-analysis on 8.2 gives identical output with and without turbo; user CPU 146 s → 84 s.
• Not run locally, left to this PR's CI: Windows, 8.2 ZTS, the x86_64 gate, musl and macOS 8.2.

The gnu-php8.2 and gnu-php8.2-zts images were published by running turbo-build-image.yml (workflow_dispatch) on this branch before opening the PR.

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