docs: normalize legacy plan names to current tiers

[karlwaldman]

Replaces the legacy Reservoir Mastery tier name in streaming-related docs, comments, the example, and the WebSocket subscription-rejected error message with current billing language.

Streaming / WebSocket gates at Professional plan ($99/mo) or higher per GET /billing/plans.

Changes

• README.md — streaming section availability line.
• examples/streaming.ts — header comment.
• src/client.ts — stream resource doc comment.
• src/resources/streaming.ts — module doc comment, rig-count comment, and the runtime reject_subscription error message string.
• tests/resources/streaming.test.ts — updated the assertion regex (/Reservoir Mastery/ → /Professional plan/) to match the new error string.

Comments/strings only; no functional code paths changed. npm run build passes; streaming test suite passes (17/17). No version bump.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c84069d1-00ba-4c8e-bafc-03d3482ca159

📥 Commits

Reviewing files that changed from the base of the PR and between 764b099 and a4862a2.

📒 Files selected for processing (5)

• README.md
• examples/streaming.ts
• src/client.ts
• src/resources/streaming.ts
• tests/resources/streaming.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/plan-name-normalization

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