Make SSH Effect usage more idiomatic

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What Changed

• Converted @t3tools/ssh error classes from Data.TaggedError to schema-backed Schema.TaggedErrorClass definitions and added SSH error union schemas.
• Added Duration-first timeout fields for SSH command and tunnel readiness flows while keeping the old millisecond fields as deprecated compatibility inputs.
• Replaced schema-error instanceof checks with hoisted Schema.is guards and added focused coverage for serializable SSH errors.

Why

This keeps the SSH package aligned with idiomatic Effect practices: native Duration values flow into timeout/schedule/process APIs, and tagged errors now have structured schemas for serialization and schema-aware narrowing.

UI Changes

Not applicable; no UI changes.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

  

Note

Replace instanceof checks and numeric millisecond timeouts with Effect Duration and schema-based predicates in SSH packages

• Rewrites SSH error classes in packages/ssh/src/errors.ts from Data.TaggedError to Schema.TaggedErrorClass, making them encodable/decodable and checkable via Schema.is instead of instanceof.
• Replaces raw millisecond constants with Duration constants throughout packages/ssh/src/tunnel.ts and packages/ssh/src/command.ts; effective timeout durations are unchanged.
• Adds a timeout?: Duration.Input field to RunSshCommandOptions and waitForHttpReady, deprecating the old *Ms numeric fields while retaining backwards compatibility.
• Risk: callers that relied on instanceof checks against SSH error classes may need to switch to Schema.is-based predicates.

^{Macroscope summarized c66a839.}