chore(examples): remove the broken pool_metadata example

[scarmuega]

examples/pool_metadata uses type = "Deno", a filter that has been removed
from the codebase, so the example fails to load. It also pointed main_module
at a ./filter.js that was never shipped (only filter.ts is present).

Custom-filter usage is already demonstrated by the wasm_basic (WasmPlugin)
example, so this removes the dead example rather than porting it. It was already
excluded from the Examples docs showcase added in #939.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6a1217c6-e3dc-4bc4-b7e2-3941fd894160

📥 Commits

Reviewing files that changed from the base of the PR and between 44da48e and c7b0cd8.

📒 Files selected for processing (3)

• examples/pool_metadata/.gitignore
• examples/pool_metadata/daemon.toml
• examples/pool_metadata/filter.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-pool-metadata-example

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