feat(bashkit): Phase 5 - Array support

[chaliy]

Summary

Add indexed array support to the bash interpreter.

Features

Array Declaration

• arr=(a b c) - Array literal assignment
• arr[0]=value - Indexed element assignment

Array Access

• ${arr[0]} - Single element access
• ${arr[@]} and ${arr[*]} - All elements
• ${#arr[@]} - Array length (number of elements)

Implementation

AST Changes

• Assignment now has optional index field for arr[n]=value
• New AssignmentValue enum: Scalar(Word) vs Array(Vec<Word>)
• New WordPart::ArrayAccess { name, index } for ${arr[...]}
• New WordPart::ArrayLength(name) for ${#arr[@]}

Parser Changes

• Handle arr=(...) syntax where ( is a separate token
• Parse array subscripts in assignments
• Parse ${arr[...]} access patterns in words
• Avoid treating arr=( as function definition

Interpreter Changes

• Added arrays: HashMap<String, HashMap<usize, String>> storage
• Expand array access with @ or * to all elements
• Evaluate arithmetic expressions in array indices

Test plan

• 104 tests passing (+4 new array tests)
• Basic array declaration and access
• All elements expansion
• Array length
• Indexed assignment
• Clippy clean

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