fix(storage): recover untracked branch graphs

[ScriptedAlchemy]

Summary

• recover valid untracked branch databases into deterministic protected branch metadata during store consolidation
• confine metadata paths to the profile shard and validate every graph snapshot with SQLite quick-check
• protect recovered and source-preserved branch stores from automatic GC

Tests

• cargo test --lib migrate::consolidate::tests
• cargo test --lib branch_meta::tests
• cargo test --lib branch::tests
• cargo clippy --workspace --all-targets --locked -- -D warnings

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Latest commit: 6c935e7

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[ScriptedAlchemy]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

Reviewed commit: 6c935e774c

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