OpenSystemsDevelopment / qpdf

…eplace `getArrayNItems` with `size`, and improve error handling logic.

…Items` with subscript operators, introduce `std::cmp` utilities, and remove redundant debug traces.

…logic, and replace redundant code with subscript operators.

…lify `withinLimits` logic, and improve code readability with subscript operators.

…` and `getArrayNItems` with subscript operators for readability and cleaner syntax.

…edundant debug traces.

…and improve `findInternal` readability.

Implement subscript operators (`operator[]`) to provide indexed access to `QPDFObjectHandle` for both `size_t` and `int` types.

Add error handling for missing or invalid Resources and invalid or du…

…otations in page objects

- Repair invalid or missing Resources in page object trees with warnings
- Remove invalid Annots arrays with warnings
- Warn about duplicate annotations
- Update test cases and output to reflect new error handling.
- Improve robustness for annotation and resource validation.

Refactor QPDF::ResolveRecorder

…`, and simplify member access.

Remove temporary file accidentally included in #1518

Revert temporary renaming of `qpdf_pages_fuzzer`.

Fuzzer was temporarily renamed in #1466 in order to allow a (fixed) time-out to age-out.

Refactor `QPDFWriter`: remove unused `stream_decode_level` check in c…

…logic in call to `initializeSpecialStreams`.

Refactor linearization checks: change `checkLinearizationInternal` to…

…mplify control flow, and update method returns.

Add new private-API methods `BaseHandle::size` and `BaseHandle::empty`

…lize type conversions, and improve clarity across multiple modules.

…jectHelper`: replace `getArrayNItems` with `size`, simplify array traversal, and centralize `empty` checks for improved clarity and efficiency.

…mplify array traversal, and centralize `empty` checks for improved clarity and efficiency.

…roduce `empty` checks, and use `std::cmp_less` and `emplace_back` for better clarity and efficiency.

…ize`, and centralize `empty` checks.

Refactor array handling in `QPDFObjectHandle`: replace `int` with `size_t` for size and index operations, introduce utility functions for type conversions, and simplify sparse array logic.

…`warn`, streamline condition handling.

… warnings, and centralize utility methods.

Refactor `ImageOptimizer`: enforce `final` overrides, switch to `uniq…

… pipelines and simplify conditions.

Refactor `ResourceFinder`: streamline logic and optimize data structu…

Allow null `callbacks` in content stream handling

Introduce null checks for `callbacks` in `QPDFObjectHandle` to allow content streams to be parsed without ParserCallbacks. Update `QPDFJob` to pass `nullptr` instead of `DiscardContents` for parsing.

Disallow `--deterministic-id` with encrypted output and improve error…

…or deterministic ID generation (fixes #1235).

Refactor `validatePDFVersion` and `findHeader`: simplify logic, impro…