Introduce a way to load external content when an agent review code#6128
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Thank you! Just minor comments to address and then we should land it ASAP.
Introduce ExternalContent as the common loader for review-time files fetched over HTTP. It strips frontmatter, caches the fetched body, and reports load failures with context. The loader uses a shared retrying fetch helper so skills and future review-context content use the same network behavior.
Add a stdlib-only schema parser for review-context.toml, including reusable predicate definitions, boolean composition, file predicates, metadata predicates, and file or revision load actions. The validator rejects unknown fields and malformed rules before the runtime loader sees them, and exposes bugbug-validate-review-context for repository-side checks.
Add the initial review-context runtime: fetch review-context.toml from GitHub, match rules against changed files, deduplicate load actions, and inject fetched files with an audit manifest. Cross-repository file loads are restricted to the rule repository unless explicitly allow-listed, and the parsed rules file is cached briefly to avoid repeated fetches during adjacent reviews.
Extend review-context matching with Bugzilla component lookup for patches that have an associated bug, failing closed when metadata is unavailable. Also implement fetch_revision actions for Phabricator revisions and GitHub commits so rules can include trusted related diffs as review context.
Thread review_context_repo, review_context_branch, extra_context_toml, and content overrides through the CodeReviewTool. When matching rules load content, the prompt receives the formatted external context and the tool response records the content manifest for auditing.
Add developer and rule-author documentation for review-context.toml, including validation, matching semantics, trust policy, metadata predicates, fetch_revision, testing overrides, and prompt injection. The example TOML demonstrates the intended full rule language separately from the subset currently active in the loader, and the docs examples are covered by tests to keep them valid.
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See the doc and example in the last commit first.