fix: align debug logger variable names with logXxx convention

[Copilot]

Three files used non-standard names (var log, var debugLog) and two packages each declared a var logHelpers — inconsistent with the logXxx convention in AGENTS.md and creating ambiguity when grepping.

Renames

Non-standard names → logXxx:

• internal/auth/header.go: log → logAuth
• internal/guard/context.go: log → logContext
• internal/guard/registry.go: debugLog → logRegistry

Disambiguate duplicate logHelpers across packages:

• internal/server/{http_helpers,middleware,sdk_logging}.go: logHelpers → logServerHelpers
• internal/mcp/helpers.go: logHelpers → logMCPHelpers

Before/after:

// before
var log      = logger.New("auth:header")   // auth/header.go
var debugLog = logger.New("guard:registry") // guard/registry.go
var logHelpers = logger.New("server:helpers") // server/http_helpers.go
var logHelpers = logger.New("mcp:helpers")    // mcp/helpers.go

// after
var logAuth          = logger.New("auth:header")
var logRegistry      = logger.New("guard:registry")
var logServerHelpers = logger.New("server:helpers")
var logMCPHelpers    = logger.New("mcp:helpers")

All call sites updated; no behavioral changes.

[Copilot]

Pull request overview

Aligns debug logger identifiers with the repository’s logXxx naming convention without behavioral changes.

Changes:

• Renames ambiguous logger variables.
• Updates all associated call sites.
• Disambiguates helper loggers across packages.

Show a summary per file

File	Description
internal/auth/header.go	Renames the authentication logger.
internal/guard/context.go	Renames the context logger.
internal/guard/registry.go	Renames the registry logger.
internal/mcp/helpers.go	Disambiguates the MCP helper logger.
internal/server/http_helpers.go	Disambiguates the server helper logger.
internal/server/middleware.go	Updates helper logger references.
internal/server/sdk_logging.go	Updates the response logger reference.

Review details

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• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Medium