fix(browser): semconv HTTP status by default; release browser 0.10.1, effect-sdk 0.9.1 - #1184

🟢 Confidence 5/5 · safe to merge
The new isTimeout branch only widens the error case for AbortSignal.timeout() and leaves app-driven aborts untouched; the added browser test exercises it and fails without the change.
_{quality 100/100 · no findings · tests covered · risk low}

The follow-up makes a fetch rejected by AbortSignal.timeout() count as an error again, without changing how app-driven aborts are classified, and marks error.message as gone in the docs and tests. Contained and safe to merge.

• isTimeout treats a TimeoutError rejection or signal reason as a failure
• Fetch timeout now sets Error status despite signal.aborted being true

_{900cf35 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}