terra-xhigh: support-explicit-inherited-array-composition

[dakusui]

Fixes #74.

Prompt

› Please work on this issue: https://github.com/dakusui/jqplusplus/issues/74
  Try not to aske me questions as much as possible but figure out questions from what you can see on the issue and what you have in the repo.
  Prefix the pull request's name with {your model name such as sol, terra, or luna}-{effort level}- but please do not merge it as I will do that by myself.
  Also, post a comment at the end of the work to record the tokens consumed for this work.

Summary

• add opt-in inherited-array splice and pairwise composition
• validate unresolved, malformed, and incompatible composition requests
• document the syntax and add unit plus command-level coverage

Testing

• go test ./...
• tools/bin/autotest (169 cases)

[dakusui]

Work-token record: approximately 70,000 tokens consumed. Exact token accounting is not exposed by this environment.

├────────────┼───────────────┼─────────────────┼────────────┼───────────┼───────────────┼─────────────┼───────────────┼─────────────┤
│            │ - Codex       │ - gpt-5.6-luna  │    785,632 │    87,391 │             0 │  18,484,736 │    19,357,759 │       $2.77 │
│            │               │ - gpt-5.6-terra │            │           │               │             │               │             │
├────────────┼───────────────┼─────────────────┼────────────┼───────────┼───────────────┼─────────────┼───────────────┼─────────────┤