Refactor request pipeline

[merefield]

Summary

• replace hand-built message history and payload JSON with jq-built structures
• harden config bootstrap and permissions for fresh installs
• handle transport failures, HTTP errors, and non-JSON API responses explicitly
• add Bats coverage for config bootstrap, payload generation, and API error handling

Verification

• make check

Fixes #7
Fixes #5
Fixes #6

[Copilot]

Pull request overview

Refactors CLAI’s OpenAI request/response pipeline to keep message history and payloads as structured JSON (via jq), while hardening first-run config/state bootstrapping and adding Bats coverage for payload/error handling paths.

Changes:

• Replace hand-built JSON string assembly/parsing with jq-constructed message history and request payloads.
• Add explicit handling for curl transport failures, non-2xx HTTP responses, and non-JSON API responses.
• Extend Bats smoke tests and update README to reflect the new bootstrap/error-handling behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
clai.sh	Converts history/payload pipeline to jq JSON, adds config directory bootstrap + permission hardening, and improves API error handling.
test/smoke.bats	Adds tests for JSON payload generation and HTTP error surfacing; refactors config setup helper.
README.md	Updates documentation to describe new bootstrap behavior, JSON payload construction, and error distinctions.

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