fix: Web search with quotation marks causes 400 error. (#210)

[ssnailed]

This PR is a reimplementation of the web_search_perplexity and web_search_tavily tools using jq to generate the json body POSTed by curl.

Since jq is already a requirement of this script this is an elegant solution.

This was tested with claude sonnet 4:

temp) search this: test "test"                                                                                                                                                                                                                                0
I'll search for 'test "test"' using web search to find the most relevant results.
Call web_search {"query":"test \"test\""}
The search for 'test "test"' returned a general definition. The term "test" refers to a means of evaluating or examining something. It can be used in various contexts such as:

- **Assessment**: Educational tests or evaluations
- **Experiment**: Scientific tests or trials
- **Software testing**: Quality assurance and debugging processes
- **Speed tests**: Performance measurements
- **General evaluation**: Any form of examination or trial

Is there a specific type of test or context you're looking for more information about? I can search for more specific details if you let me know what particular aspect of testing interests you.

temp) .info
model                   claude:claude-sonnet-4-20250514
temperature             null
top_p                   null
use_tools               web
max_output_tokens       8192 (current model)
save_session            null
compress_threshold      4000
rag_reranker_model      jina:jina-reranker-v2-base-multilingual
rag_top_k               5
dry_run                 false
function_calling        true
stream                  true
save                    false