docs(python): map connector extras and dependencies

[DDDonut (daleselaji-dev)]

Problem

Python users and contributors must inspect package metadata and individual connector modules to discover which install extra and upstream version constraints each connector requires.

Root Cause

The dependency extras are declared in python/pyproject.toml, but there was no single reference mapping public connector import roots to those extras or documenting compatibility-sensitive constraints.

Solution

Add a source-backed connector dependency map and link it from the Python README quick-install section.

Changes

• Add python/CONNECTOR_DEPENDENCIES.md covering AI, vector-store, memory, search, protocol, and database connectors.
• Document base connectors, provider extras, platform markers, Python-version-specific ONNX constraints, and facade modules.
• Link the map from python/README.md.

Testing

• Readability and README-link assertions passed with Python 3.10.
• python/pyproject.toml and Markdown files were read as UTF-8 successfully.
• pre-commit -c python/.pre-commit-config.yaml run --files python/README.md python/CONNECTOR_DEPENDENCIES.md passed; all configured hooks were skipped because the changed files are Markdown.
• git diff --check passed.
• Python unit tests, typecheck, and provider integration tests were not run because this is a documentation-only change.

Compatibility/Risk

Documentation-only; no runtime or packaging behavior changes. The version values intentionally mirror python/pyproject.toml; maintainers should update both files when connector extras change.

Notes for Reviewer

Please verify that the public import roots and provider mappings match the current connector exports, especially the base-only AstraDB and NVIDIA entries and the dual azure/mongo requirement for Cosmos DB.

Linked Issue

Closes #14327

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[Copilot]

Pull request overview

Adds a centralized Python documentation reference that maps Semantic Kernel connector import roots to their corresponding pip install extras and key upstream version constraints, and links that reference from the Python README to improve discoverability.

Changes:

• Added python/CONNECTOR_DEPENDENCIES.md documenting connector import roots, extras, and selected compatibility-sensitive constraints.
• Linked the new connector dependency map from the Python README “Quick Install” section.
• Fixed a malformed bullet in the README documentation links section.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
python/README.md	Adds a link to the connector dependency map and fixes a documentation list item formatting issue.
python/CONNECTOR_DEPENDENCIES.md	Introduces a connector-to-extra/version-constraint mapping reference for Python users/contributors.

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[github-actions]

MAF Automated Review — Iteration 1

Result: No findings
Scope: full PR (1 commit(s)): 859a5f8a2ba1
Model: claude-opus-4.8

Overview

This documentation-only PR adds python/CONNECTOR_DEPENDENCIES.md, a hand-maintained map from public connector import roots to install extras and provider version constraints, plus a single link line in python/README.md. All four reviewers independently cross-checked every table row against python/pyproject.toml and the actual module tree under python/semantic_kernel/connectors/: every documented import root exists, every extra name matches a real [project.optional-dependencies] key, and every version constraint (including the ONNX 3.10 split, platform markers, the Cosmos DB dual azure/mongo requirement, and the base-vs-extra mcp pins) mirrors the source of truth exactly. The residual risk is bounded to documentation drift with no CI enforcement and two omitted legacy Cosmos memory_stores roots — both Low-priority and non-blocking. There is no executable code, so no runtime, packaging, or security surface is affected.

Reviewed the supplied pull-request change set across correctness, security/reliability, architecture, and failure behavior.
No publishable findings remained after source verification for this scope.