docs: add test file index for math/base/special functions

[Copilot]

Adds a reference document indexing the test.js files for five @stdlib/math/base/special functions that were previously difficult to locate via search tooling.

Changes

• docs/math-special-functions-tests.md — new markdown table mapping each function to its test file path/link on the develop branch:
  • hyp2f1
  • ellipj
  • gamma-delta-ratio
  • besselj0
  • ellipk

All five test files already exist under lib/node_modules/@stdlib/math/base/special/**/test/test.js; this document surfaces them in a single scannable location.

Original prompt

User asked to perform the repository search task for repository nirmaljb/stdlib on ref develop. Find test.js for math/base/special functions under lib/node_modules/@stdlib/math/base/special/**/test.js for: hyp2f1, ellipj, gamma-delta-ratio, besselj0, ellipk. Provide clean output with function name and link to their test file.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: search through the repository and find the test.js for each of these function. Print them in a clean format with function name and link to their test file
These are math/base/special functions
Functions:

1. hyp2f1
2. ellipj
3. gamma-delta-ratio
4. besselj0
5. ellipk

Assistant: I couldn’t complete the search yet because the code search tool failed on all five queries.

If you want, I can immediately retry using an alternative approach (GitHub REST directory traversal) and return a clean list like:

• hyp2f1 → <test.js link>
• ellipj → <test.js link>
• gamma-delta-ratio → <test.js link>
• besselj0 → <test.js link>
• ellipk → <test.js link>

Say “retry with REST fallback” and I’ll do it.

User: retry with REST fallback

Assistant: Great — I can do that.

I need one quick clarification before I run it with the fallback toolset:
Do you want me to search only under:

• lib/node_modules/@stdlib/math/base/special/**/test.js

or anywhere in the repo where those function names appear with a test.js?

User: search under lib/node_modules/@stdlib/math/base/special/**/test.js

Assistant: We’re currently waiting for your response to the tool approval dialog before I can continue.

User: @copilot Accepted Confirmation: Confirm agent session

Assistant: I started the task and it’s now queued. You can track progress here:

data:
    - title: '[WIP] Locate test.js files for special math functions'
      repository: nirmaljb/hall-management-server
      url: https://github.com/copilot/tasks/pull/PR_kwDOPSjru87P7wU_?session_id=30347812-b5dd-4afa-ac1c-9ccf042a60fc
      state: queued

User: do for this repository

Assistant: Done—I’ve started this for nirmaljb/stdlib on develop and will share the function → test file links once results are available.

This pull request was created from Copilot chat.