Add Testing for cxjs Functions

[Lightning11wins]

This PR creates a new set of test suites using node:test to test the JS client-side Centrallix functions, and also adds make test-js in the centrallix directory to run the new tests.

Stats

tests    1482
suites   33
pass     1482
fail     0
skipped  0
runtime  1.336s

[Lightning11wins]

I haven't reached coverage of all the functions I'd like to test yet, so this will stay a draft until then.

[Lightning11wins]

@greptileai Review please

[greptile-apps]

Greptile Summary

This PR adds a comprehensive JS test suite (33 test files, 1,482 tests) for the cxjs_* and htr_* client-side functions in ht_render.js, using Node.js node:test and a vm-based sandbox in _setup.js. It also updates ht_render.js to use Array.isArray() and typeof v === "object" && v !== null instead of instanceof for the aggregate functions, and adds make test-js and make test-js-coverage Makefile targets.

• ht_render.js: Eight instanceof Array/instanceof Object guards in cxjs_min, cxjs_max, cxjs_sum, and cxjs_count are replaced with the more robust Array.isArray() and typeof checks; these improve cross-realm correctness (e.g., arrays from iframes).
• _setup.js: Creates a minimal vm.createContext sandbox with browser-global stubs so ht_render.js can be loaded and exercised in Node without a real DOM.
• Makefile / configure: test-js and test-js-coverage targets are added; Node.js is detected by autoconf and falls back to $PATH lookup at runtime.

Confidence Score: 5/5

Safe to merge — the only runtime code change is a minor correctness improvement in four aggregate functions, and the rest is additive test infrastructure.

All eight instanceof replacements in ht_render.js are mechanically equivalent for normal inputs and strictly better for cross-realm arrays. The 1,482 new tests use a well-isolated vm sandbox with no shared mutable state between test files, and the expected values were verified against the actual implementations. The Makefile targets have proper fallback logic and correctly unquoted shell globs.

No files require special attention.

Important Files Changed

Filename	Overview
centrallix-os/sys/js/ht_render.js	Replaces instanceof Array/instanceof Object with Array.isArray() and typeof checks in four aggregate functions; strictly more correct, no behavioral regression for normal inputs.
centrallix-os/sys/js/tests/_setup.js	VM sandbox that loads ht_render.js into a minimal browser-stub context; stubs cover all top-level globals accessed at parse/init time. Approach is sound for this test scope.
centrallix/Makefile.in	Adds test-js and test-js-coverage phony targets with runtime NODE fallback; shell glob is unquoted so the shell expands it before Node sees it.
centrallix-os/sys/js/tests/cxjs_getdate.test.js	Uses a FakeDate class that remaps local-time methods to UTC, eliminating timezone dependency; clock-offset edge cases (day/month/year boundary crossings) are well covered.
centrallix-os/sys/js/tests/cxjs_round.test.js	Exhaustive coverage of the custom rounding algorithm, including negative dec, float precision pitfalls, signed-zero propagation, and overflow/underflow via extreme magnitudes and dec values.
centrallix-os/sys/js/tests/cxjs_convert.test.js	Covers integer/double/string conversions including currency-prefix stripping logic; edge cases like 1e3, hex, signed zero, and falsy-but-non-null datatypes are all exercised.
centrallix-os/sys/js/tests/cxjs_count.test.js	Tests array, object, and scalar inputs including sparse arrays and inherited enumerable properties; verifies null/undefined/NaN exclusion behavior.
centrallix-os/sys/js/tests/htr_boolean.test.js	Covers htr_boolean truthy/falsy paths including string case variants, numeric coercion via ==, and array-to-number coercion edge cases.
centrallix-os/sys/js/tests/cxjs_rand.test.js	Validates range, non-determinism, seed-warning behavior, and the null/undefined no-warning path using a captured console.warn counter.
centrallix/configure.ac	Adds a single AC_PATH_PROG([NODE], [node], []) line; standard autoconf pattern, consistent with other tool probes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["make test-js"] --> B["Detect node binary\n(configure / PATH fallback)"]
    B --> C["node --test\ncentrallix-os/sys/js/tests/*.test.js"]
    C --> D["Each test file:\nrequire('./_setup')"]
    D --> E["_setup.js\nvm.createContext(sandbox)"]
    E --> F["vm.runInContext(\nht_render.js, sandbox\n)"]
    F --> G["sandbox exports:\ncxjs_* / htr_* functions"]
    G --> H["Test assertions\nassert.equal / assert.ok"]

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flowchart TD
    A["make test-js"] --> B["Detect node binary\n(configure / PATH fallback)"]
    B --> C["node --test\ncentrallix-os/sys/js/tests/*.test.js"]
    C --> D["Each test file:\nrequire('./_setup')"]
    D --> E["_setup.js\nvm.createContext(sandbox)"]
    E --> F["vm.runInContext(\nht_render.js, sandbox\n)"]
    F --> G["sandbox exports:\ncxjs_* / htr_* functions"]
    G --> H["Test assertions\nassert.equal / assert.ok"]

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_{Reviews (2): Last reviewed commit: "Update Makefile to find tests in shell c..." | Re-trigger Greptile}

[Lightning11wins]

This PR is ready for human review.