Add missing say test cases from canonical data

[andyjiang9]

Fixes #855.

The say practice exercise test suite was missing four cases that exist in the problem-specifications canonical data:

Description	Input	Expected
thirty	30	thirty
ninety-nine	99	ninety-nine
two hundred	200	two hundred
nine hundred ninety-nine	999	nine hundred ninety-nine

Changes

• Added the four cases to SayTest.scala in canonical order, marked pending to match the existing convention.
• Synced their UUIDs into .meta/tests.toml.

Verification

• configlet sync --exercise say --tests reports "The say exercise has up-to-date tests!" (the tests.toml matches configlet's generated output exactly).
• configlet lint passes.
• bin/test say passes — the reference solution in .meta/Example.scala already handles all four cases, so all 19 tests are green.

Scope is limited to the single say exercise per the contribution guidelines.

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[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.

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[no important files changed]

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