chore: bump waveflow-core rev + simplify rename handler

[InstaZDLL]

Summary

Picks up waveflow#184 which changed `PostgresProfileRepository::rename_for_user` from `bool` to `Option` via `UPDATE … RETURNING`. The handler's two-call dance (`rename_for_user` then `get_for_user`) collapses to one match: the updated row comes back in the same round-trip.

Diff at the call site

```

• Ok(true) → get_for_user → Some(profile) | None (race 404) | Err
• Ok(false) → 404
• Err → 500
  ```

becomes

```

• Ok(Some(profile)) → 200 + body
• Ok(None) → 404
• Err → 500
  ```

The false-404 window a concurrent DELETE could open between our UPDATE and the read-back is gone — both writes commit (or neither does) inside the same statement.

Rev: `24ffa58` → `bfb899b`

Test plan

• `cargo check --all-targets`
• `cargo fmt --all --check`
• `cargo clippy --all-targets --all-features -- -D warnings`
• CI Linux: full `cargo test` against the Postgres service — `update_renames_in_place` should still go green with the new shape.

Signed-off-by: InstaZDLL github.105mh@8shield.net

[coderabbitai]

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