docs: add Windows / WSL note to README install section (#10)

[advancedresearcharray]

Carries forward the rebased version of #38 (by @mvanhorn) so it can merge cleanly.

Summary

Refs #10 (first checkbox only — README Windows callout). The native Windows setup path and native CLI testing items remain; #69 is the PR that closes #10.

Adds a short ### Windows subsection to the README's Quick Start section. It documents the mitigation the maintainer flagged in the issue thread: npx mex-agent setup works in any terminal and avoids the WSL/Windows path mismatch entirely. For users on the legacy setup.sh flow, a one-paragraph warning explains the "module not found" error and tells them to keep install/build/CLI inside one environment.

Changes from #38

• Rebased onto current main (was 17 commits behind)
• Resolved README conflict: Windows subsection now sits after Quick Start, before How It Works
• Updated outdated promexeus references to mex-agent to match the current README

Files changed

• README.md — adds an 8-line ### Windows subsection after the global-install block and before ## How It Works

Test plan

• No code changes
• Existing install commands and headings unchanged
• New section follows the README's existing tone (informal, direct)
• Link to Windows: module not found error when running CLI after WSL setup #10 for context

Supersedes #38 once merged.

[advancedresearcharray]

@theDakshJaitly This is ready for review when you have a moment — docs-only change, CI green, rebased on current main. Closes #10 and supersedes #38.

[advancedresearcharray]

@theDakshJaitly — friendly ping for review when you have a moment.

This is the rebased carry-forward of #38 (closes #10, first checkbox only). CI is green and the branch merges cleanly onto current main.

Change: adds an 8-line ### Windows subsection after Quick Start (documents npx mex-agent setup as the friction-free path + warns against mixing WSL/native Windows with legacy setup.sh).

Happy to close #38 once this lands. No code changes.

[advancedresearcharray]

Verified README placement and wording against #10 maintainer note. Rebases cleanly onto current main; no code changes.

[advancedresearcharray]

Pushed a small follow-up: added a blockquote callout with the exact #10 wording (Run all commands inside WSL or Git Bash. Do not mix environments.) so the legacy setup.sh warning is more prominent. Npx-first guidance unchanged. CI re-ran green.

[advancedresearcharray]

@theDakshJaitly Thanks for closing #38 in favor of this one — appreciate the quick turnaround.

#65 is ready whenever you have a moment:

• Docs-only (README.md)
• Rebases cleanly on current main
• CI green
• Closes the first checkbox in Windows: module not found error when running CLI after WSL setup #10 (README Windows callout)

No further changes needed from our side.

[theDakshJaitly]

Approved. Docs-only Windows/WSL callout, correct mex-agent naming, credits @mvanhorn's original #38. Adjusted the description from Closes to Refs #10 so the issue stays open for the remaining checkboxes (native setup path / native CLI testing), which #69 covers.