[qiansc]

Summary

With context update --pending, only pages whose cited text changed are candidates, and the decision rejected every other path as "Not candidates". When a new export or a shared change affected an existing page whose citations were unchanged, such as an overview, the agent could not submit that revision, and new_topics does not accept existing pages.

• The update request now lists the other existing pages that cite the source as scope_pages. They need no decision; the scope decision can include one with an instruction. Paths outside the candidates and scope_pages are still rejected.
• The source-update procedure and the knowledge-updates guide each gain one sentence on scope_pages.
• The version moves to 0.7.90, with a CHANGELOG entry.

Tests

• New regression test in projectPendingSourceUpdate.test.ts: a moved citation plus a new export, then the scope decision revises architecture/overview.md (revisions-prepared), and the baseline holds until the revision is delivered.
• The pending-update tests (5) and the repo-content integration tests (18, including the non-candidate rejection message) pass locally; typecheck and lint are clean. The full suite runs in CI.

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