Revert CHANGELOG entry for docs-only change and update CLAUDE.md

Author: brendan-kellam

CHANGELOG.md

@@ -7,9 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### Added
-- Added sizing guide documentation with infrastructure recommendations based on deployment scale. [#923](https://github.com/sourcebot-dev/sourcebot/pull/923)
-
 ## [4.11.7] - 2026-02-23
 
 ### Changed

CLAUDE.md

@@ -199,3 +199,4 @@ PR description:
 After the PR is created:
 - Update CHANGELOG.md with an entry under `[Unreleased]` linking to the new PR. New entries should be placed at the bottom of their section.
 - If the change touches `packages/mcp`, update `packages/mcp/CHANGELOG.md` instead
+- Do NOT add a CHANGELOG entry for documentation-only changes (e.g., changes only in `docs/`)