skills(agent-tracing): trim skills to what an implementing agent needs

[JeremyFunk]

Stacked on #1115.

• Cut human-guide links, backend background, tested-version notes, restated code
• Removed opentelemetry/references/go.md; other languages follow the generic steps
• Do-not lists: only silent, non-obvious mistakes not already in the steps (230 → 25 items)
• Genkit: GenkitForMaple processor inlined (verbatim from the guide)
• OTLP header: quoted literal space everywhere. Checked SDK source: Python exporter ≥1.27 (liberal parsing), JS, Java, .NET, Go all accept a space; every framework pin resolves ≥1.27
• OpenTelemetry skill framework list: added Cloudflare Agents, Genkit
• smolagents: enable_genai_semconv=True is required
• Cost: no change; Maple reads gen_ai.usage.cost then gen_ai.usage.total_cost, so both skills are right

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[maple-review-bot]

Maple review

Nothing to review

All 28 changed files are skill markdown docs; no source, infra, config or test files are touched, so there is nothing to review.

What was checked

• pr_changed_files classified all 28 paths as docs, no source/infra/config/test files left

_{3a8e204 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}