Research: Create Research Plan for Helpfile Guidelines/Instructions Usability Testing

### Dependency
- #2208

### Overview
We need to create a research plan to define the research scope, goals, and methods for the Helpfile Guidelines/Instructions Usability Testing.

### Action Items
- [x] Create Research Plan Google Doc utilizing the TDM style guides
- [x] Add information for each section below and check off as you go:
- [x] Background
- [x] Research Questions and Objectives
- [x] Participants
- [x] Research Assumptions
- [x] Research Methods
- [x] Data Analysis
- [x] Timeline
- [x] Resources
- [x] Wiki Pages
- [x] Further Documentation
- [x] Add research plan to issue #2353
- [ ] Get Research Plan approved by PMs
- [ ] Check off the Dependency on #2237
- [ ] Add Research Plan Link to resources section of #2241
- [ ] Add Research Plan to the wiki documentation

### Resources/Instructions
#### Resources for creating this issue
- #1666
- Reference previous research plan: [TDM: RP004 Reset Button Research Plan](https://docs.google.com/document/d/12GB3YQfh6cy9ynXriRNNwWAMQ8PTpkHfc8J4qPBXMO0/edit).
- [Wiki Page](https://github.com/hackforla/tdm-calculator/wiki/RP010:-Helpfile-Guidelines-Instructions-Usability-Testing)

#### Resources gathered during the completion of this issue
- [RP010: Research Plan](https://docs.google.com/document/d/18G-n_M8-WxeLOYDwMZNJnOkXRJWGzrsBdDH56lkHNlE/)

#### Slides
- [Staging Deck](https://docs.google.com/presentation/d/1crZ3IxqA4hAu3qzD7ns93Ieuqjwh6wyEtuX_46cP-fg)
- ~[Staging Deck, slide 2203](https://docs.google.com/presentation/d/1crZ3IxqA4hAu3qzD7ns93Ieuqjwh6wyEtuX_46cP-fg/edit?slide=id.g34c0baa6967_14_0#slide=id.g34c0baa6967_14_0)~
- Release Deck
- [2025-04-29 Release Deck, slide 2203](https://docs.google.com/presentation/d/1y3vgXPXJf1ctAEyKaLLB_roKyoKv-n1WLwGNu1xeXBM/edit?pli=1&slide=id.g34d4d94b7dd_0_0#slide=id.g34d4d94b7dd_0_0)
- [2025-05-13 Release Deck, slide 2203](https://docs.google.com/presentation/d/1u7-iTsYgBCimvq1JV8oc9MlFkGd9SepB19b4vciP7kg/edit#slide=id.g3529838178c_0_1)
- [2025-05-27 Release Deck, slide 2203](https://docs.google.com/presentation/d/1l3wrArtEihG2G9vSRif5WAo0hLA-meyTpkugP4FegDE/edit#slide=id.g3582f1b0373_0_0)
- [2025-06-10 Release Deck, slide 2203](https://docs.google.com/presentation/d/1s8XuD5jD-LnHMfh2GjfyJsw3w6n_CWl6Rye1uMzxAlw/edit?slide=id.g35d8111f4f7_0_60#slide=id.g35d8111f4f7_0_60)

Review the RP010 Research Plan Google Doc and the linked wiki page, then verify the remaining checklist items. Seek PM approval, resolve the dependency reference, add the plan link to issue #2241, and add the completed plan to the wiki; done means those items are confirmed and checked off.

Written by the indexing model from the issue text.