test(engine): expand profile merge coverage

[EffortlessSteven]

Motivation

• Strengthen unit test coverage for the profile merge engine to prevent regressions in hierarchical merge semantics.
• Codify expected precedence rules so child defaults do not inadvertently erase parent overrides and the most-specific profile wins for complex fields.

Description

• Added new unit tests in crates/engine/src/profile_merge.rs that verify scalar hierarchy behavior for ffb_gain, degrees_of_rotation, and torque_cap so child default scalars do not erase parent overrides.
• Added tests to confirm a child FilterConfig fully replaces parent filter configuration (reconstruction, friction, damper, inertia, slew rate, and curve_points).
• Added tests asserting LED and haptics inheritance: absent child LED/haptics preserve parent configs and most-specific profile LED/haptics configs win when present.
• Adjusted test initializers to satisfy lints (initialized structs with ..Default::default() to avoid clippy field-reassign warnings).

Testing

• Ran formatting with python scripts/cargo_fmt_workspace.py and it completed successfully.
• Ran linting with cargo clippy -p racing-wheel-engine --all-targets -- -D warnings and it completed without warnings.
• Ran the targeted unit tests with cargo test -p racing-wheel-engine profile_merge and all new and existing profile_merge tests passed (20 passed, 0 failed).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: c6b2be79-6b9f-46a1-b886-11e0707bf8d1

📥 Commits

Reviewing files that changed from the base of the PR and between 549ea59 and e300829.

📒 Files selected for processing (1)

• crates/engine/src/profile_merge.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/improve-unit-testing

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[factory-droid]

Droid finished @EffortlessSteven's task —— View job

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Droid review complete.

No inline comments were posted (0 candidates). No candidate comments to validate or post; the PR is limited to additional profile-merge unit tests and looks correct.

[github-actions]

Compatibility Layer Usage Report

Current usage count: 193
Baseline usage count: 193
ℹ️ Usage unchanged

📈 Usage Trend (Last 30 Days)

• Peak usage: 193
• Current trend: insufficient_data (0%)
• Projected removal: unknown

Usage Details

• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/compat_impl.rs:69 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/hid/linux.rs:1253 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/hid/linux.rs:1282 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/hid/mod.rs:230 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/protocol.rs:290 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/protocol.rs:742 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/engine/src/protocol.rs:749 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/schemas/src/service_example.rs:189 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/schemas/src/service_example.rs:218 - temp_c
• /home/runner/work/OpenRacing/OpenRacing/crates/schemas/src/integration_test.rs:79 - temp_c

... and 183 more occurrences

Migration Guide

To migrate these usages, replace:

• .temp_c() → .temperature_c
• .faults() → .fault_flags
• .wheel_angle_mdeg() → .wheel_angle_deg
• .wheel_speed_mrad_s() → .wheel_speed_rad_s

See Migration Patterns for detailed examples.