Fix single-element array parsing: enable R = [10] syntax

[Copilot]

Problem

Single-element arrays could not be created in Yaksok. Code like R = [10] would fail to parse, preventing users from creating arrays with just one element.

Root Cause

The parser only had rules for:

• Empty arrays: []
• Multi-element arrays: [item1, item2, ...] (via comma-separated Sequence)

There was no parsing rule to handle single-element arrays like [10].

Solution

Added a new parsing rule in /core/prepare/parse/rule.ts to handle the [ Evaluable ] pattern:

{
    pattern: [
        { type: Expression, value: '[' },
        { type: Evaluable },
        { type: Expression, value: ']' },
    ],
    factory: (nodes, tokens) => {
        const item = nodes[1] as Evaluable
        return new ListLiteral([item], tokens)
    },
}

The rule is positioned before the existing [ Sequence ] rule to ensure single-element arrays are matched first.

Test Coverage

Added comprehensive test cases covering different data types:

R = [10]       # number array
S = ["hello"]  # string array  
T = [3.14]     # float array
U = [true]     # boolean array

All existing array functionality remains unchanged - empty arrays [] and multi-element arrays [1, 2, 3] continue to work as before.

Fixes #93.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• canonical-bos01.cdn.snapcraftcontent.com
• dl.deno.land
  • Triggering command: curl -s REDACTED (dns block)
  • Triggering command: curl --fail --location --progress-bar --output /home/REDACTED/.deno/bin/deno.zip REDACTED (dns block)
• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[rycont]

LGTM!