Add comprehensive test coverage across all packages

[Copilot]

Several exported functions had zero test coverage, and key edge cases were untested across all packages. This adds targeted tests for uncovered paths without modifying source code.

@jabascript/query

• getLiteralValue — exported but completely untested; adds full describe block covering "null" → null, "undefined" → undefined, and passthrough strings
• createSearchParams — empty array value, 2-element array not matching the Option pattern (falls through to regular array append), Option tuple with a missing key (serializes as "undefined")
• parseSearchParams — null/undefined within array entries, 3+ occurrences of the same non-[] key

@jabascript/form-data

• 3-level deep nesting via dot notation
• Duplicate key converting a scalar to a 2-element array, then growing beyond 2
• Indexed arrays inside nested paths (e.g. order.items[0].sku)

@jabascript/core

• createEnum — direct property access, empty object input
• debounce — sequential independent calls both firing correctly
• getInitials — partial options object (only separator, no none), both options provided together, lowercase input with separator that must uppercase

[Copilot]

Pull request overview

Adds targeted Vitest coverage for previously untested/under-tested exported helpers across the monorepo packages, focusing on edge cases without changing production source.

Changes:

• @jabascript/query: adds tests for getLiteralValue, additional createSearchParams fallthroughs, and parseSearchParams multi-value behavior.
• @jabascript/form-data: adds tests for deeper dot-notation nesting, duplicate key aggregation, and indexed arrays inside nested paths.
• @jabascript/core: adds tests for sequential debounce runs, getInitials option interactions, and createEnum direct property access / empty input.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
packages/query/tests/index.test.js	Expands query utility coverage including getLiteralValue and edge-case param parsing/serialization.
packages/form-data/tests/index.test.js	Adds coverage for deeper nesting, repeated keys, and complex indexed paths in parseFormData.
packages/core/tests/index.test.js	Adds coverage for sequential debounce usage and getInitials option combinations.
packages/core/tests/enum.test.js	Adds coverage for direct enum property access and empty enum behavior.

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[Copilot]

Test description says it "should skip null/undefined array entries by default", but the assertion expects the literal "null" entry to be preserved in the resulting array. This reads as contradictory and will mislead future readers; either update the test name to match the current behavior (arrays include null/undefined literals even when allowFalsy=false) or change the expectation/input to actually verify skipping behavior.

[Copilot]

The test name says it "should use default none fallback" when only { separator } is provided, but the expectation is undefined (i.e., no fallback applied). Rename the test to reflect the actual behavior being asserted, or (if the default is intended to be "N/A" per the function docs) adjust the expectation and implementation accordingly.

Suggested change

	it("should use default none fallback when options object provides only separator", () => {
	it("should not apply none fallback when options object provides only separator", () => {