Show PR titles in automated release notes (follow-up to #24)

[oobabooga]

Follow-up to #24. GitHub won't expand a reference into its title inline in release descriptions, so this fetches each PR's title at build time and shows it, with the number and commit as links.

Before

Generated markdown:

Automated Unsloth llama.cpp CUDA (Linux + Windows) + ROCm + macOS prebuild for upstream [b9625](https://github.com/ggml-org/llama.cpp/releases/tag/b9625), merged with:

- ggml-org/llama.cpp#24423 @ [49fc372](https://github.com/ggml-org/llama.cpp/pull/24423/commits/49fc3723ca84b729fa64bf93b88b858360bc2ffa)
- ggml-org/llama.cpp#24523 @ [2846a38](https://github.com/ggml-org/llama.cpp/pull/24523/commits/2846a387c2bf90a39194b818557ce86e19b99c07)

Renders as (in the release notes):

Automated Unsloth llama.cpp CUDA (Linux + Windows) + ROCm + macOS prebuild for upstream b9625, merged with:

- ggml-org#24423 @ 49fc372
- ggml-org#24523 @ 2846a38

After

Generated markdown:

Automated Unsloth llama.cpp CUDA (Linux + Windows) + ROCm + macOS prebuild for upstream [b9625](https://github.com/ggml-org/llama.cpp/releases/tag/b9625), merged with:

- DiffusionGemma ([#24423](https://github.com/ggml-org/llama.cpp/pull/24423), commit [49fc372](https://github.com/ggml-org/llama.cpp/pull/24423/commits/49fc3723ca84b729fa64bf93b88b858360bc2ffa))
- Preliminary MiniMax-M3 support ([#24523](https://github.com/ggml-org/llama.cpp/pull/24523), commit [2846a38](https://github.com/ggml-org/llama.cpp/pull/24523/commits/2846a387c2bf90a39194b818557ce86e19b99c07))

Renders as (in the release notes):

Automated Unsloth llama.cpp CUDA (Linux + Windows) + ROCm + macOS prebuild for upstream b9625, merged with:

- DiffusionGemma (#24423, commit 49fc372)
- Preliminary MiniMax-M3 support (#24523, commit 2846a38)

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 52d3dc021d

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[oobabooga]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: 7145458355

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".