Max length configurable and docs update

[spaze]

Make the maxlength when fetching configurable

Docs update:

• Document the cURL client parameters (user agent, max length)
• Document DNS lookups and timeouts
• Document that the the trustworthiness of the key used to sign the file cannot be verified, meaning that GNUPG_SIGSUM_KEY_MISSING is fine

[Copilot]

Pull request overview

Adds configurability for the maximum fetched response size in the cURL-based fetcher and updates the README with additional fetching/DNS/signature-verification guidance.

Changes:

• Make the cURL fetcher’s maximum response length configurable via constructor parameter.
• Update README to document default User-Agent usage and maximum fetched file size configuration.
• Add README documentation about DNS lookups and signature verification caveats.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/Fetcher/HttpClients/SecurityTxtFetcherCurlClient.php	Adds $maxResponseLength constructor option and uses it to truncate responses.
README.md	Documents User-Agent, max file size, DNS lookup behavior, and signature verification notes.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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