Safer jit and improved DSL specs

[FrancescAlted]

In this PR:

• Make bundled TCC JIT safer under SELinux using anonymous executable storage, with quiet interpreter fallback and opt-in diagnostics.
• Add global and scoped JIT configuration covering backend selection, floating-point accuracy, tracing, compiler flags, and cache settings.
• Extend native DSL syntax with docstrings, semicolons, multiline comments, pass, Python-style numeric literals, and chained comparisons preserving single evaluation and short-circuiting.
• Fix compiler-path quoting, Boolean-output temporary typing, loop-variable semantics, and Windows ARM64 build configuration.
• Update documentation

Fixes #730

[Copilot]

Copilot review overview

🟡 Changes recommended

Empty constructors and several reductions mishandle newly documented per-call JIT options.

Review effort: Balanced
Findings: 2 · 1

Open (3)

• mean() fails to forward per-call execution options · New
• arange() rejects execution options for empty ranges · New
• Completed-review record uses the wrong miniexpr revision · New

What changed in this PR

Adds safer native JIT fallback and configuration, while expanding Python-like DSL syntax and backend consistency.

Changes:

• Adds global/scoped JIT policies and safer TCC/CC fallback.
• Supports docstrings, semicolons, numeric literals, pass, and chained comparisons.
• Expands integration tests and JIT/DSL documentation.

File	Description
AGENTS.md	Clarifies repository operation policy.
CMakeLists.txt	Updates miniexpr dependency.
RELEASE_NOTES.md	Records JIT and DSL changes.
doc/​conf.py	Updates generated reduction guidance.
doc/​reference/​dsl_syntax.md	Documents expanded DSL syntax.
doc/​reference/​index.rst	Adds JIT reference page.
doc/​reference/​jit.rst	Documents JIT configuration and fallback.
doc/​reference/​lazyarray.rst	Links LazyArray JIT guidance.
doc/​reference/​ndarray.rst	Documents constructor JIT options.
doc/​reference/​reduction_functions.rst	Documents reduction JIT options.
plans/​portable-DSLs.md	Proposes portable DSL artifacts.
plans/​safer-jit-execution.md	Records implementation plan.
plans/​safer-jit-review.md	Records validation and risks.
src/​blosc2/​__init__.py	Exports JIT configuration APIs.
src/​blosc2/​blosc2_ext.pyx	Passes configuration into miniexpr.
src/​blosc2/​dsl_compare.py	Lowers JavaScript comparison chains.
src/​blosc2/​dsl_js.py	Supports chains and pass in JavaScript.
src/​blosc2/​dsl_kernel.py	Expands DSL validation and emission.
src/​blosc2/​jit_config.py	Implements global and scoped JIT settings.
src/​blosc2/​lazyexpr.py	Applies JIT policy during evaluation.
src/​blosc2/​ndarray.py	Documents ramp-constructor JIT options.
tests/​ndarray/​safer_jit_libtcc.c	Provides relocation-failure test double.
tests/​ndarray/​safer_jit_probe.py	Exercises fresh-process JIT paths.
tests/​ndarray/​test_dsl_comparisons.py	Tests chained-comparison semantics.
tests/​ndarray/​test_dsl_js.py	Tests JavaScript DSL extensions.
tests/​ndarray/​test_dsl_kernels.py	Tests expanded native DSL syntax.
tests/​ndarray/​test_jit_options.py	Tests configuration precedence and scope.
tests/​ndarray/​test_safer_jit.py	Tests quiet fallback and caching.

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