Variable length quantity

[A-O-Emmanuel]

This PR updates the PHP track implementation of variable-length-quantity to bring it fully in line with the current canonical data from problem-specifications.

✅ Summary of Changes

1. Ran configlet sync for the exercise
   Updated exercise metadata using:
   configlet sync -u -e variable-length-quantity --yes --docs --filepaths --metadata --tests include

Ensured Markdown instructions and .meta files reflect the latest canonical content.

Resolved the previously unsynced instructions.md.

2. Cleaned up strict types comments
   Removed unnecessary // strict_types comments from:

Test file

Example solution

Preserved the directive itself (declare(strict_types=1);) as required for PHP track consistency.

Left the comment intact in the student stub file, per track conventions.

3. Synced test metadata
   Added missing UUIDs to test DocBlocks.

Updated all #[TestDox] annotations to match canonical descriptions exactly.

Ensured every test case corresponds 1:1 with the canonical JSON.

4. Updated test method names
   Renamed all test methods to reflect the full canonical description for clarity and consistency.

Ensured naming is deterministic and generator‑friendly.

5. Added exercise to bin/auto-sync.txt
   Inserted variable-length-quantity alphabetically to keep the file properly ordered.

Ensures future syncs will include this exercise automatically.

6. Reviewed, adjusted, and ordered test cases
   Verified all test cases match canonical order.

Removed outdated patterns and ensured full alignment with current problem-specifications.

Confirmed no missing or duplicated tests.

7. Added contributor entry
   Added my GitHub handle to .meta/config.json as a contributor to this exercise.

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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