Add .[] as jq-compatible alias for [*] and document jq interop

[kkozik-amplify]

Summary

Lowers the learning curve for users coming from jq by adding .[] as an alias for [*] in hq path expressions, and adds documentation showing how hq and jq complement each other.

Changes

• Add .[] → [*] normalization in parse_path() so jq-style iteration syntax works in hq queries
• Add "Piping to jq" section to hq docs with practical examples of combining hq + jq
• Add "Coming from jq" translation table mapping common jq idioms to their hq equivalents
• Add unit tests for the .[] alias in standalone, chained, and continuation positions

Manual testing checklist

• hq 'resource.[]' file.tf produces the same output as hq 'resource[*]' file.tf
• hq 'resource.[].tags' file.tf works with continuation after the alias
• Existing [*] queries are unaffected

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🤖 Co-Authored-By: Claude Opus 4.6 (1M context) Claude Code