[Python][Docs] Add architecture documentation for http-client-python emitter

[Copilot]

• Explore the http-client-python repository structure
• Understand the emitter and generator architecture
• Review existing documentation and structure
• Create comprehensive architecture documentation
• Add the documentation to the website
• Review and finalize documentation
• Fix ASCII diagram box alignment
• Add m2r transformation to emitter responsibilities
• Align directory structure comments
• Ensure all diagram right borders align at column 66
• Align all # comments to column 43 in directory tree
• Simplify component details to reduce duplication
• Fix Prettier formatting issues

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[python] docs to introduce source code of http-client-python</issue_title>
<issue_description>Context:
http-client-python contains 2 part of code,
(1) first part is in folder "emitter" written by typescript which handle info from typespec-client-generator-code, then pass handled data to "generator/pygen" written by python to generate sdk.
(2) In pygen, it is pre-handled again in "preprocess" then pass to "codegen". In "codegen", "models" prepares all necessary info then "serializers" render files with template files of "templates" and parameter info from "models" to generated sdk file.

Ask:
With up context, write a brief introduction to "http-client-python" so that developers could understand the repo and develop quickly.

NOTE:
(1) context is just help you understand the repo but DO NOT be limited by context so you can read the files or code of this repo to make a good doc
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [python] docs to introduce source code of http-client-python #9273

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[github-actions]

No changes needing a change description found.

[tadelesh]

The directory introduction seems a little bit duplicate among all the docs.

[tadelesh]

@copilot Try to simplify the part of introducing the function of different files and folders. I found there are some duplications among all the docs.

[Copilot]

@copilot Try to simplify the part of introducing the function of different files and folders. I found there are some duplications among all the docs.

Simplified in commit 7888d9d. Removed verbose file-by-file descriptions and the detailed directory tree with inline comments from the Component Details section. The documentation now provides concise summaries while avoiding duplication across sections.

[msyyc]

@copilot fix the following ci failure

Checking formatting...
panic: reflect: unimplemented: AssignableTo with interface
[warn] packages/http-client-python/ARCHITECTURE.md
[warn] Code style issues found in the above file. Run Prettier with --write to fix.
 ELIFECYCLE  Command failed with exit code 1.

[Copilot]

@copilot fix the following ci failure

Checking formatting...

...

Fixed in commit 36e7958. The issues were:

1. Line 40 had inconsistent arrow formatting (──▶ instead of ───▶)
2. Lines 40 and 76 had borders not aligned at column 66

Both lines now have consistent three-dash arrows and all diagram borders align at column 66.