fix(script): parse profile hooks when packages are inherited

[alexsmolya]

Fixes #273

Summary & Root Cause

In scripts/chwd, parse_profiles previously coupled hook capture to if not profiles[profile].packages. For child profiles that inherit packages from their parent profile without defining their own packages entry (such as [handheld.rog-ally] and [handheld.msi-claw]), profiles[profile].packages remained nil, causing the parser to stay in the package-matching branch on every line and skip all hook extraction (post_install, post_remove, conditional_packages, etc.).

As a result, profile installation succeeded in installing package dependencies, but post_install never executed and the required PipeWire/WirePlumber directory and symlink setup was not performed.

Changes

• Decouple hook capture from packages presence in scripts/chwd so all declared hooks on child profiles are parsed regardless of whether packages is defined locally or inherited.
• Added unit test in src/profile.rs (handheld_profile_parse_test).
• Added regression tests in tests/chwd_spec.lua asserting child profiles properly inherit packages and retain their own hooks.

Validation

• Lua regression tests PASS (verified handheld.rog-ally, handheld.msi-claw, and child hook overrides).
• cargo test: 24 passed, 0 failed.
• cargo clippy --all-targets -- -D warnings: clean.
• cargo fmt --check: clean.
• git diff --check: clean.
• Note: Physical ROG Ally hardware runtime validation was unavailable, but the affected profile parsing code path and hook resolution have been fully verified via regression tests.

[ventureoo]

Lua's part of changes are LGTM.