chore: refine gitignore for byterover

.brv/.gitignore

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+# Dream state and logs
+dream-log/
+dream-state.json
+dream.lock
+
+# Review backups
+review-backups/
+
+# Generated files
+config.json
+_queue_status.json
+.snapshot.json
+_manifest.json
+_index.md
+*.abstract.md
+*.overview.md

.brv/context-tree/release_management/ci/git_ignore_state_verification.md

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+---
+title: Git Ignore State Verification
+summary: Verified that newly ignored files were untracked from Git index while remaining on disk, with no tracked files matching current ignore rules.
+tags: []
+related: []
+keywords: []
+createdAt: '2026-04-24T16:54:17.841Z'
+updatedAt: '2026-04-24T16:54:17.841Z'
+---
+## Reason
+Capture the verified ignore and untracking outcome after updating gitignore rules.
+
+## Raw Concept
+**Task:**
+Verify and record the repository ignore-state cleanup after gitignore changes
+
+**Changes:**
+- Untracked files that were now covered by ignore rules
+- Confirmed the Git index no longer contained tracked ignored files
+- Kept ignored files on disk locally
+
+**Flow:**
+update ignore rules -> check tracked ignored files -> remove from index only -> verify clean ignored state
+
+**Timestamp:** 2026-04-24T16:54:12.932Z
+
+## Narrative
+### Structure
+The repository now has ignore rules that cover generated .brv context artifacts and other local build/tooling paths, and the cleanup was performed without deleting local files.
+
+### Dependencies
+Verification depended on Git ignore-state inspection, specifically git ls-files -ci --exclude-standard.
+
+### Highlights
+The resulting state was clean: no tracked files remained that matched ignore rules, and the ignored files persisted locally as expected.
+
+## Facts
+- **brv_context_tree_tracked_state**: Tracked files under .brv/context-tree/ were newly ignored and removed from the Git index only, while remaining on disk. [project]
+- **ignore_verification_result**: Verification via git ls-files -ci --exclude-standard returned no output, meaning no tracked files remained that matched the current ignore rules. [project]
+- **ignored_local_paths**: The ignored files still existed locally and showed as ignored, including .brv/context-tree/**, .brv/config.json, .brv/dream-*, .husky/_/, dist/, and node_modules/. [project]