Clean mojibake comments in streams module

[silentgeckoaudit3801]

Summary

• replace mojibake em-dash text in src/streams.ts comments with plain ASCII wording
• simplify corrupted section-divider comments for deprecation warnings, private helpers, and parsing
• keep runtime code unchanged

Validation

• git diff --check
• rg -n "?|?|?|?" src/streams.ts returned no matches

Note: I did not install dependencies or run the test suite because this is a comments-only cleanup and the checkout has no node_modules.

Closes #216

[silentgeckoaudit3801]

Thanks for merging this and the related recent fixes (#230, #231, #232, #234, #236, #237, #239, and #241). Could you point me to the official GrantFox / Maybe Rewarded claim or payout step for these accepted contributions?

I want to follow the documented process and avoid posting any private payment details in public unless that is explicitly the expected flow.