Add unit tests for scoring and ignore parsing

[rogeralsing]

Adds table-driven unit tests for strategy scoring and ignore hash parsing/creation.

Also makes ignore parsing robust to common copy-paste formats from CLI output (e.g. "[deadbeef...]" and "0xdeadbeef...").

Closes #2.

[rogeralsing]

Progress notes:

• Added unit tests covering strategy scoring behavior (similarity scaling + indent-imbalance penalty + inlineable shape matching).
• Added ignore parsing tests, plus a small fix so ignore entries accept common copy/paste formats from CLI output (brackets) and optional 0x prefix.
• Verified with go test ./....