Add error codes and doc links to registry errors

[flossypurse]

Summary

• Add ResonateRegistryError exception class with error codes (1000-1003) and documentation links matching the error docs
• Update registry.py to raise ResonateRegistryError instead of plain ValueError for registry-specific errors
• Handle function-not-found gracefully in bridge: catch ResonateRegistryError in _process_msgs, log the error, and drop the task instead of crashing the process via os._exit(1)
• ResonateRegistryError extends both ResonateError and ValueError for backward compatibility with existing except ValueError handlers

Error codes added

Code	Name	Description
1000	REGISTRY_VERSION_INVALID	Function version must be greater than zero
1001	REGISTRY_NAME_REQUIRED	Function name is required
1002	REGISTRY_FUNCTION_ALREADY_REGISTERED	Function already registered
1003	REGISTRY_FUNCTION_NOT_REGISTERED	Function not registered (will drop)

Error output example

[1003] REGISTRY_FUNCTION_NOT_REGISTERED. Function 'game' is not registered. Will drop. (See https://docs.resonatehq.io/debug/errors#1003 for more information)

This is part of the composite debugging/developer UX improvement tracked in resonatehq/resonatehq-workq#6.

Resolves #336

Related PRs

• Server: resonatehq/resonate (fix/error-codes-and-urls)
• Docs: resonatehq/docs.resonatehq.io (fix/error-codes-docs)

Test plan

• All 228,236 tests pass (pytest tests/test_resonate.py)
• Verify function-not-found no longer causes process exit
• Verify error output includes code and documentation link

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