fix(builtins): add jq -R raw input and awk printf parens

[chaliy]

Summary

• jq: Implement -R/--raw-input flag — treats each input line as a JSON string instead of parsing as JSON. Also supports -Rs (slurp entire input as single string). Unblocks CSV processing patterns like jq -Rs 'split("\n")'.
• awk: Support printf("format", args) parenthesized syntax in addition to existing printf "format", args. Common in awk scripts for JSON generation.

Root cause

• Issue eval: complex_markdown_toc lowercase anchor generation blocked by tr character classes #368: complex_markdown_toc eval failures were caused by awk printf("format") syntax not being supported, not tr character classes as initially suspected
• Issue eval: data_csv_to_json fails for GPT-5.3-Codex — exhausts 10 turns #369: data_csv_to_json eval failures were caused by missing jq -R raw input mode, preventing CSV-to-JSON conversion patterns

Test plan

• Added unit tests for jq -R, jq -Rs, and jq -Rs with split
• Added unit tests for awk printf("format", args) and CSV-to-JSON pattern
• Added spec tests: jq_raw_input, jq_raw_input_slurp, awk_printf_parens, awk_printf_parens_begin
• All existing tests pass (AWK: 98, JQ: 115, Bash: 1214)
• cargo clippy clean, cargo fmt clean

Closes #368
Closes #369