[jsfez]

The GitHub integration page said full access is "required for baseline selection based on commit history". That is not true anymore: without content access, the Argos SDK reads the commit history in the CI job, finds the merge base, and sends Argos the commit SHAs of the merge base and its ancestors (referenceCommit + /baseline lookups, parentCommits as a fallback). Argos picks the baseline among them.

Changes:

• GitHub integration, Choose your access level: full access is still recommended (it doesn't depend on the CI checkout's history) and still required for Merge Queue; limited access now says the SDK finds the baseline from the CI checkout.
• GitHub integration, new "How Argos finds the baseline without content access" under the limited access setup: what the SDK sends (commit SHAs, never file contents), the GitHub Actions pull_request test-merge case, what the checkout needs (origin remote, shallow clones fine), and the orphan + ARGOS_REFERENCE_COMMIT fallback.
• Run Argos in CI and CLI reference: "connected to GitHub or GitLab, this happens server-side" becomes "connected to GitLab, or to GitHub with full access".

Left as is: "Merge Queue is not supported" with limited access, not re-checked here.

Merges cleanly with #273, which touches the same three pages in other sections.

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