fix(authbridge): rename plugins_sparc.go to avoid Go GOARCH filename collision

[vz-ibm]

Problem

The sparc plugin is never compiled into any authbridge-proxy build, on
every published image tag we tried (v0.6.0-alpha.12, v0.7.0-alpha.2) and
even a fresh from-source build of main with default (empty) GO_BUILD_TAGS.
The sidecar's registered-plugin list is always missing sparc:

level=WARN msg="reloader: reload failed" error="build: outbound: unknown plugin \"sparc\" (registered: [a2a-parser ibac inference-parser jwt-validation litellm-budget-track mcp-parser opa static-inject token-broker token-exchange])"

Root cause

authbridge/cmd/authbridge-proxy/plugins_sparc.go has an explicit
//go:build !exclude_plugin_sparc constraint, which correctly evaluates
true by default (same pattern as every other plugins_*.go file in that
directory). But Go's build tool also applies an implicit constraint based
on filename: any file matching *_GOARCH.go is restricted to that
architecture — and sparc is itself a legacy Go GOARCH value (for the
historical SPARC CPU, alongside sparc64; see go/build/syslist.go's
knownArch). So plugins_sparc.go is silently interpreted as "only build
when GOARCH=sparc" and excluded from every normal amd64/arm64 build —
independent of, and regardless of, the explicit //go:build line.

This is a permanent bug affecting every build of the "full" authbridge
image (the authbridge-lite variant already excludes sparc on purpose via
its own GO_BUILD_TAGS, so it's unaffected/expected).

Verification

Built a throwaway copy of authbridge/ with only this rename applied
(content otherwise unchanged) and confirmed the plugin's own string literal
("sparc: reflector unavailable, failing open") now appears in the compiled
binary via strings. Rebuilt the real local image with the same rename and
confirmed deploy-agent.sh --plugin-preset sparc-only (rossoctl/workload-harness)
now resolves the plugin correctly end-to-end:

Plugins (resolved): a2a-parser mcp-parser inference-parser sparc
Agent is ready and accessible!

and the AuthBridge sidecar logs reloader: pipelines swapped /
drained old pipelines confirming the SPARC-enabled config loaded live.

Fix

Pure rename, no logic change: plugins_sparc.go → plugins_sparcplugin.go.

Note

sparc is present on both main and release-0.6 — this fix likely needs
backporting to release-0.6 as well if that branch still cuts patch
releases.

[coderabbitai]

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• authbridge/cmd/authbridge-proxy/plugins_sparcplugin.go

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• authbridge/cmd/authbridge-proxy/plugins_sparcplugin.go

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[OsherElhadad]

Thank you @vz-ibm for fixing it! LGTM
@huang195 / @pdettori can you pls review?

[OsherElhadad]

LGTM