Folderize in_memory_repo/projection_protocol.rs

[patrickleet]

Implements [[tasks/rust-less-context-20]]

Stacked on #127 / tasks--graphql-qs-epic.

Summary

• Replaced src/in_memory_repo/projection_protocol.rs with projection_protocol/mod.rs plus concern modules.
• Moved bodies into state, state helper, read helper, direct projection, store impl, util, and test files.
• Preserved the previous module path exports for in-memory repository users.

Verification

• cargo test --lib in_memory_repo: 32 passed, 0 failed, 436 filtered.
• cargo test --features graphql,sqlite --lib: 634 passed, 0 failed.
• cargo test --test distributed_read_model --features sqlite 2>/dev/null || true: 4 passed, 0 failed.

Rebase

• git fetch origin tasks--graphql-qs-epic && git rebase origin/tasks--graphql-qs-epic: branch already up to date; verification rerun afterward.

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