[Repo Assist] refactor(server): extract session ID header extraction into helper

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Summary

Addresses the security-sensitive duplication identified in issue #7137. An identical 3-line block that extracts the session ID from X-Agent-ID and Authorization headers was duplicated in two places within internal/server:

• session.go:124–126 — inside extractAndValidateSession()
• middleware.go:194–196 — inside WithSDKLogging()

If the header names change (e.g., a new X-Session-ID header is added) or the extraction logic shifts, a missed update could cause session tracking divergence — the middleware's logging could show a different session ID than the one actually used for authentication.

Changes

internal/server/session.go — add package-private helper:

// extractSessionIDFromRequest extracts the session ID from the X-Agent-ID and
// Authorization headers of an HTTP request. Returns "" if neither header is present.
func extractSessionIDFromRequest(r *http.Request) string {
    return auth.ExtractSessionIDFromHeaders(
        r.Header.Get("X-Agent-ID"),
        r.Header.Get("Authorization"),
    )
}

The extractAndValidateSession function is updated to call this helper instead of repeating the 3-line extraction block.

internal/server/middleware.go — WithSDKLogging updated to call extractSessionIDFromRequest(r) instead of the inline 3-line block.

No imports were added or removed (both packages already imported auth).

Test Status

Build and tests could not be run — proxy.golang.org is blocked in this environment (pre-existing infrastructure limitation). The changes are syntactically verified by inspection:

• The helper is placed before its first caller in session.go
• Both call sites are updated identically
• The auth import remains in both files (still used elsewhere)

Closes #7137

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