feature: migrate the control rpc to connect

[rustatian]

• replace the legacy RPC() any surface (dead code in v6 — the rpc plugin no longer collects it) with RPC() (string, http.Handler) returning the generated CentrifugoApi connect handler, so the PHP-facing publish/broadcast/... API is reachable again on the v6 RPC plane
• all 33 methods proxy 1:1 to the connected Centrifugo server through a single generic forwarder (responses pass through whole instead of field-by-field copies); gRPC status errors map to connect codes, and the not-connected case returns CodeUnavailable
• the Centrifugo-facing transports are untouched: the gRPC API client (client.go) and the CentrifugoProxy gRPC server (plugin.go) stay exactly as they were
• depends on feature: add centrifugo api and temporal service connect packages api-go#21 (and feature: add temporal control-plane connect service api#75): api-go is pinned to a pseudo-version of that branch — bump to v6.0.0-beta.13 once tagged
• update dependencies (root and tests modules)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d920e42d-38ce-496d-9a90-621313049c2b

📥 Commits

Reviewing files that changed from the base of the PR and between 6fe6041 and 6a70273.

⛔ Files ignored due to path filters (3)

• go.sum is excluded by !**/*.sum
• go.work.sum is excluded by !**/*.sum
• tests/go.sum is excluded by !**/*.sum

📒 Files selected for processing (6)

• go.mod
• plugin.go
• rpc.go
• rpc_forward_test.go
• rpc_test.go
• tests/go.mod

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/connect-rpc

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[codecov]

Codecov Report

❌ Patch coverage is 98.70130% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.51%. Comparing base (6fe6041) to head (6a70273).

Files with missing lines	Patch %	Lines
rpc.go	98.64%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #205       +/-   ##
===========================================
+ Coverage   39.26%   72.51%   +33.24%     
===========================================
  Files           9        9               
  Lines         848      564      -284     
===========================================
+ Hits          333      409       +76     
+ Misses        483      123      -360     
  Partials       32       32               

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[Copilot]

Pull request overview

This PR migrates the Centrifuge plugin’s control RPC surface from the legacy RPC() any shape to a Connect-RPC handler (RPC() (string, http.Handler)), restoring access to the PHP-facing publish/broadcast/etc API on the v6 RPC plane by proxying requests to the connected Centrifugo gRPC API client.

Changes:

• Replaced the legacy RPC implementation with a Connect-RPC CentrifugoApi handler and a generic forwarder that proxies calls to the Centrifugo gRPC client and maps gRPC status codes to Connect codes.
• Updated Plugin.RPC() to return the generated Connect handler for mounting on RoadRunner’s RPC server.
• Bumped dependencies (including pinning api-go to a pseudo-version) and updated module sums; adjusted unit test for the new Connect-based RPC entrypoint.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rpc.go	Reimplements Centrifugo control RPC as a Connect-RPC handler with a generic forwarding helper.
plugin.go	Updates RPC() to return (string, http.Handler) using the generated Connect handler.
rpc_test.go	Updates the not-ready test to call the Connect handler method and assert Connect error code.
go.mod	Adds connectrpc.com/connect and bumps api-go to the required pseudo-version.
go.sum	Adds sums for the new Connect dependency and updates sums for bumped modules.
go.work.sum	Workspace sums updated, but currently inconsistent with go.mod/go.sum for some entries.
tests/go.mod	Updates indirect dependencies for the tests module (incl. api-go pseudo-version).
tests/go.sum	Updates sums to match bumped test-module dependencies.

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