fix(tui): lower durable event log level - #36479

What

1. Before: one durable event becomes N INFO lines
With N connected TUIs, every client writes the same durable event to the shared normal log.

1 durable event
      |
      +-- TUI 1 --> INFO  event { type, aggregateID, seq }
      +-- TUI 2 --> INFO  event { type, aggregateID, seq }
      ...
      +-- TUI N --> INFO  event { type, aggregateID, seq }

shared INFO log: N copies, with growth proportional to connected TUIs

2. After: INFO describes connections; DEBUG carries event metadata
The normal log keeps connection lifecycle messages, while detailed durable-event metadata remains available when DEBUG logging is enabled.

INFO   event stream connecting / connected / disconnected / reconnecting
DEBUG event { type, aggregateID, seq }

shared INFO log: no per-durable-event copies

This supersedes the duplicate durable event logging symptom tracked in #36283.

Fixes #36446

Implementation

• packages/tui/src/context/sdk.tsx: emit per-durable-event metadata at DEBUG instead of INFO.
• packages/tui/test/cli/tui/use-event.test.tsx: assert that durable event diagnostics use the DEBUG level.

Scope

This does not change event delivery, SSE subscriptions, durable event contents, or connection lifecycle logging.

Testing

• cd packages/tui && bun run test test/cli/tui/use-event.test.tsx (6 passed, 0 failed)
• cd packages/tui && bun typecheck (passed)
• Push hook: bun turbo typecheck --concurrency=3 (31 successful, 31 total)
• git diff --check (passed)