refactor(whatsrust): make ABI dependencies explicit

[Andiveli]

Summary

• Remove the private use abi::*; facade import.
• Make every affected Rust module and facade test import its ABI symbols from crate::abi explicitly.
• Preserve behavior, public API, and ABI while making coupling auditable.

Changes

File	Change
whatsrust/src/lib.rs	Removed the wildcard ABI import; facade now contains module declarations and explicit reexports only.
whatsrust/src/{actions,facade_tests,lifecycle,media,presence,queries,read_sync,registrations}.rs	Added or relocated explicit crate::abi::{...} imports for required bridge symbols.

Chain Context

• Immediate parent: PR refactor(whatsrust): remove final facade-owned definitions #337, exact base refactor/whatsrust-facade-final-cleanup at 5cbbd3d.
• Diagram: PR refactor(whatsrust): remove final facade-owned definitions #337 -> 📍 this PR.
• Start: PR refactor(whatsrust): remove final facade-owned definitions #337 leaves private wildcard ABI coupling available to child modules and tests.
• End: ABI consumers declare their dependencies explicitly; no wildcard ABI import was added elsewhere.
• Follow-up: none; this is the final child cleanup slice.
• Out of scope: behavior, public API, ABI, unrelated refactors, merge, and CI waiting.

Testing

• cargo fmt --all -- --check
• git diff --check
• CARGO_TARGET_DIR=/home/samael/Escritorio/Programacion/public/wptui-public/target cargo check -p whatsrust --all-targets (passed, no warnings introduced)
• CARGO_TARGET_DIR=/home/samael/Escritorio/Programacion/public/wptui-public/target cargo test -p whatsrust --lib -- --test-threads=1 (24 passed)
• CARGO_TARGET_DIR=/home/samael/Escritorio/Programacion/public/wptui-public/target cargo test --test whatsrust_api_contract -- --test-threads=1 (1 passed)
• Verified no use abi::* or abi::* remains in Rust sources.
• Manual/runtime testing: N/A; source-ownership refactor with no behavior change.
• Full workspace tests: not run; outside this focused child budget.

Review Budget and Rollback

• Authored diff: 34 lines (24 additions + 10 deletions), under the 400-line budget.
• Commit: acd43c4.
• Rollback: revert acd43c4; this restores only the wildcard-import source layout on top of PR refactor(whatsrust): remove final facade-owned definitions #337.

Contributor Checklist

• Linked issue refactor(whatsrust): make ABI module dependencies explicit #338.
• Added exactly one type:* label: type:refactor.
• Ran formatting and diff checks.
• Ran focused whatsrust and API tests.
• Conventional commit format.
• No Co-Authored-By trailer.

Closes #338